Keyword cannibalization

Cannibalization happens when two or more of your pages chase the same intent — Google can't decide which to rank, so it splits signals and both end up lower than a single strong page would. It's most common on blogs that publish near-duplicate posts over time or e-commerce sites with overlapping category and filter pages. The fix is usually to consolidate the weaker page into the stronger one with a 301 redirect, or to differentiate their intent so each owns a distinct query.