The number of favourites is incorrect on my profile page. I have favourited 500 films, but on my profile page it says 505. Nothing major, of course, but it’s strange. Has anyone else encountered the same bug?
Have you unfavorited films at all?
Also, it’s possible that films you had favorited got merged to each other and that broke the counter, or that a film you had favorited was deleted from the system (eg. video games, orphaned pages, etc.), but that’s just a guess.