First off, are ALL the forums in the Forum Manager set to Index New Posts in Search Engine (if you change that, you MUST go to Maintenance > General Update Tools and Rebuild your search index). Actually, I would suggest Rebuilding your search index to see if that fixes the issue.
When you click to view the users posts, you will ONLY get the number of results set in AdminCP > Settings > Options > Searching Options > Maximum Search Results to Return . If that is set to 150 and a user has 1000 posts, you will only get 150 returned.
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