Keyword cannibalisation
Several pages on one site competing for the same query, so none of them ranks as well as one strong page would.
When two or more pages target the same intent, search engines may alternate between them or rank neither strongly. The fix is usually to merge the pages and redirect, or to differentiate them so each answers a distinct intent.
Several pages ranking for one query is not automatically a problem: it only matters when they split clicks and links that one page would otherwise collect.
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