Yo, man, that’s a super astute observation, tbh! What you're seeing isn't a bug; it's Google actively filtering its results to save resources and, increasingly, to control the data flow.
There are two main reasons for this:
- The Omitted Results Filter (The "Repeat Search" Link):
This is the oldest filter. Google automatically hides results that are too similar or come from the same domain to give you the most "diverse" and "relevant" pages up front.
When you click "repeat the search with omitted results included," you are telling Google, "I know what I'm doing; show me the duplicates and the similar pages." It temporarily lifts that diversity filter.
2. The Hard Cap (Why pages 1-9 disappear):
Google generally caps the total number of results it will display for any single query, typically around 300 to 400 results, even if the initial estimate is in the millions.
The deeper you go into results, the less relevant the information is, and Google knows that 99% of people never go past page 2. By limiting the pages, they save server load and push you to refine your search, which ultimately makes their product faster.