When a site loses Google rankings, or a brand disappears from AI answers, the cause is rarely one missing keyword. It is usually a stack of SEO issues and GEO issues: pages search engines cannot index, passages models cannot quote, and a brand described differently in English and Traditional Chinese.
This guide is for Hong Kong and Greater Bay Area teams diagnosing both channels. Search engine optimization still decides whether a URL can rank. Generative engine optimization decides whether ChatGPT, Perplexity, Gemini, and Google AI Overviews cite it. The same fault often hurts both.
If you need the definitions first, start with what GEO is and how SEO and GEO differ.
Website not ranking: indexing issues
A page cannot earn an SEO ranking if Google never stores it. These indexing issues show up most often in audits:
- A
noindextag or robots rule left on after launch - Important URLs missing from the XML sitemap, or the sitemap listing redirected and non-canonical URLs
- Duplicate URLs — parameters, trailing slashes, HTTP/HTTPS, www and non-www — without one canonical
- Soft 404s and thin doorway pages that Google chooses not to index
- Orphan pages with no internal links from indexed sections of the site
Check index coverage before rewriting copy. If the URL is crawled but not indexed, or excluded by noindex, content tweaks will not move rankings. The indexing and crawl issues guide covers those coverage states, sitemap errors, and AI crawler rules.
Technical SEO issues that block discovery
Technical SEO issues waste authority you already have. On bilingual Hong Kong sites, these are the usual blockers:
- Mobile performance. Slow largest contentful paint and layout shift push pages down, and make it less likely that an AI crawler fetches the full article. The Core Web Vitals guide covers LCP, INP, and CLS.
- Crawl traps. Faceted URLs, session IDs, and infinite calendars consume crawl budget that should reach money pages.
- Broken internal links and redirect chains. Each extra hop spends crawl on a URL that should not rank, and an AI crawler may never reach the page you meant to cite. The internal links and redirects guide covers 404s, chains, and weak site architecture.
- Hreflang and language mismatches. English and Traditional Chinese pages that do not reference each other, or that share one title and description, split relevance for the same query. Missing return tags, wrong language codes, and citations in the other language are covered in the hreflang errors guide.
- Insecure or mixed content. HTTP leftovers weaken the trust signals Google and AI platforms both use.
- Invalid structured data. JSON-LD that fails validation, or that names a different URL, price, or organization than the page shows, drops rich results and gives AI answers a second, wrong fact. The schema markup errors guide covers those conflicts.
Fix the template once. A canonical bug in a layout hurts every article, not one keyword.
On-page SEO issues
On-page SEO issues are what teams look for after a ranking drop:
- Missing, duplicated, or oversized title tags
- Meta descriptions that are empty or too short to earn the click
- More than one H1, or a page with no clear heading
- Keyword cannibalization, where several URLs target the same query and none of them wins
- Headings that never state the topic a searcher typed
Use one title that names the topic, one H1 that matches it, and a first paragraph that answers the query. That structure helps classic snippets and the passages AI systems retrieve. The title tag and meta description guide covers missing and duplicate titles, descriptions that disagree with the page, and headings that never state the query.
Content issues that suppress SEO and GEO together
Thin pages fail in both channels. A short service blurb may be indexed and still never rank, and it gives a model nothing precise to cite.
Look for these content issues:
- No direct answer in the opening paragraph
- Claims without dates, numbers, or a named author
- Outdated statistics and product names
- Pages written only to repeat a keyword, with no steps, definitions, or examples
- English-only explanations for queries people also ask in Traditional Chinese
E-E-A-T for AI visibility and content formats AI platforms cite show how to rebuild those pages so they are quotable. The thin and outdated content guide covers how to separate a short useful page from an unhelpful one, and how a stale sentence becomes the fact an AI answer cites.
GEO issues when rankings look fine
A site can hold Google positions and still be absent from AI answers. These GEO issues explain the gap:
- No citation-shaped content. Models prefer definitions, steps, comparisons, and FAQs. A page of slogans is hard to quote.
- Inconsistent brand entities. The company name, address, and services differ on the website, the Google Business Profile, and directories. Models lose confidence and cite a competitor.
- Mentions without context. A brand that never appears next to the topics it wants to own will not be retrieved for those prompts.
- One-platform tuning. Copy written only for Google AI Overviews can still fail in Perplexity or ChatGPT if it is not independently useful.
- No monitoring. Teams track keyword positions and never test the prompts customers actually ask.
For platform tactics, see how to rank in AI search. For Hong Kong listings and bilingual queries, see local SEO and GEO.
How SEO issues affect AI search rankings
AI search ranking is not a separate scoreboard, and it is not identical to blue-link rankings either. Google AI Overviews still lean on indexed pages. ChatGPT and Perplexity also retrieve live pages when a prompt needs a current source. If technical SEO issues keep a URL out of the index, that URL is unavailable as a citation.
The reverse happens too. A page can rank and still lose the AI answer because a clearer competitor page is easier to quote. Treat AI search ranking as a second check on the same URLs: indexed, unique, and specific enough to cite.
A practical order of fixes
| Priority | Issue | What to verify |
|---|---|---|
| 1 | Indexing | The URL is indexed, canonical, and listed once in the sitemap |
| 2 | Technical SEO | Mobile speed, internal links, hreflang, and HTTPS |
| 3 | On-page | One title, one H1, and no competing URL for the same query |
| 4 | Content | A direct answer, evidence, an author, and updated facts |
| 5 | GEO | Consistent brand facts, a quotable format, and AI prompt checks |
Work from the top. Publishing more articles does not repair a noindex tag or a duplicate canonical.
Questions teams ask
Why is my website not ranking on Google?
Start with indexing, then technical SEO issues, then whether another page on your own site targets the same query. A ranking drop after a redesign is often a canonical, redirect, or noindex change.
What are the most common SEO issues?
Duplicate titles, thin content, slow mobile pages, broken internal links, and index bloat from parameter URLs. On bilingual sites, add hreflang errors and English and Chinese pages that compete with each other.
Why do GEO issues remain after SEO improves?
Rankings show that Google can find the page. A citation needs a passage an AI system can lift without guessing: a definition, a step list, or a comparison with stable facts. Inconsistent brand details, and a lack of third-party mentions, keep otherwise healthy pages out of answers.
Do Hong Kong sites face different SEO and GEO issues?
Yes. Queries switch between English and Traditional Chinese, and map results depend on consistent business information. A Greater Bay Area brand also needs regional context, not a translated page that still describes another market. The Hong Kong provider checklist helps when the issues are larger than an in-house fix.
What to fix this month
- List URLs that should rank but are excluded from the index.
- Collapse duplicate titles and competing pages to one URL per topic.
- Rewrite high-impression pages so the first paragraph answers the query.
- Align the brand name and facts across the site and public profiles.
- Test a handful of customer prompts in Google AI Overviews, Perplexity, and ChatGPT, and note who is cited instead.
Search visibility now has two outcomes: a ranking in classic results, and a citation in an AI answer. The SEO issues and GEO issues above are the reasons one or both go missing.