For example, Rammstein_420 have over 160 posts, but when the forum synchronization issue hit his post count dropped to 12, and today it's down to 7. However, the forum search correctly displays all of his posts, which have not been misattributed. He's not alone, but the first one I thought of.
John

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic