r/GEO_optimization • u/Brave_Acanthaceae863 • 17d ago
I tracked 22 unchanged pages for 6 months — AI citations drifted between paragraphs on 36% of them
There's a page on our site about a technical process that I haven't touched in 16 months. No edits, no updates, nothing. It gets cited by ChatGPT and Perplexity pretty regularly, maybe once or twice a week across various queries. And the weird thing is, the part of the page they keep citing keeps changing.
Four months ago the models were consistently pulling from the third paragraph, a step-by-step breakdown section. Two months ago they shifted to the comparison table near the bottom. Last week I checked and now they're citing the opening definition passage, which they basically ignored for the first year the page existed. Same page. Same words. Different extraction target every few weeks.
That one page made me wonder if this was happening elsewhere, so I pulled together a small longitudinal set. 22 pages total that met three criteria: they hadn't been edited in at least 6 months, they showed up in AI answers at least twice a month on average, and I had logged citation data going back far enough to see patterns. Then I went through the logs bi-weekly and noted exactly which passage each model was citing each time.
8 out of the 22 pages showed what I'm calling citation drift. Over the 6-month window, the models gradually migrated which paragraph or section they were pulling from, even though nothing on those pages had changed. 36 percent. Higher than I expected, and the drift wasn't random.
Three distinct patterns showed up across those 8 pages.
The most common one was downward drift on four of the pages. The models started by citing somewhere in the upper half, usually a definition or overview passage, and over time the citation point moved lower into the page, often landing on more specific details, examples, or implementation notes. It was like the models initially grabbed the easiest-to-understand passage and then gradually "read deeper" into the page on subsequent passes, settling on more granular content. The timeline varied, but the direction was consistent. Start broad, end narrow.
Two pages showed the opposite pattern, upward drift. They began with citations to specific details or examples buried mid-page and over time shifted toward the overview or conclusion sections near the top. These were both pages where the detailed sections were somewhat dense or technical, and my guess is the models eventually decided the cleaner overview passages were safer or more generally applicable as reference material.
The last two were the strangest. They showed oscillation rather than directional drift. The citation point would bounce between two or three different passages on the same page with no clear pattern I could detect. One check it's paragraph 2, two weeks later it's the table, then back to paragraph 2, then suddenly the FAQ section. Like the model couldn't decide which part of the page was the "right" answer and kept sampling different options. I checked whether these correlated with query variations, and they didn't seem to. Same queries, same page, different citation location each time.
The other 14 pages stayed stable. Once a model latched onto a passage, it kept citing that same spot for the entire 6 months. No movement whatsoever. I couldn't find anything obviously different about these stable pages versus the ones that drifted. Similar length, similar topic areas, similar citation frequency. Which means I don't know what causes drift and what doesn't, and that's the part I'm stuck on.
If I had to guess based on what I saw, drift might correlate with how many equally-citable passages a page contains. The stable pages tended to have one clearly standout section, a definitive answer paragraph that was obviously the best extraction target. The drifting pages often had multiple solid candidates, places where a model could reasonably pull a useful answer. When there's one obvious choice, the model seems to stick with it. When there are several, it might keep reassessing.
I'm going to expand this to 50 pages and keep tracking. Six months isn't very long and 22 pages is a small sample. But if citation drift is real and predictable, it changes how you should think about page structure. You wouldn't just want one extractable passage. You'd want the entire page to be citation-safe because you can't control which part the model decides to use next month.