The search is returning dozens of matches rather than exact matches. It is also ignoring limit parameters placed in the Advanced Search.
e.g., there was an interesting Subreddit posting and I wanted to check if that username was already mentioned in postings on our forums.
So I searched for the very unique “PlantOfJazz” and it found dozens of matching threads. But none of those threads had matches for that term using the Browsers Find. Then I went into the Private Messages to do the same search. And it found the same results… that were Public threads, not messages.
I did the same search here in the Meta forum. Again it found dozens. (Some had postings with the word “Plant”. So it seems to be finding partial matches instead of exact matches.)