Can't correct title of an episode

https://www.imdb.com/title/tt0444931

I am trying to correct a title of an episode to "Snakes" but it seems to have kept its original title from a merge rather than having its new title. 

I had this happen to me on a previous edit of another show where I changed it from a special to an episode, but I forgot which one it was, I'll have to find that one out and correct in some other edit—might have been done already? Not sure.