A little Signature problem..

Alright, so I wasn't sure if this was the right place to put this post, but I'll go with it.

Um, I've tried three times to change my signature, but the old one keeps popping back up. I can't see that I'm doing something wrong, but it just won't work.
Help?

um could you possibly be hitting preview instead of save? Try erasing the old signature put the one you want to change it to in hit preview make sure its the one you want then hit save. If that doesn't work idk what it is but hopefully it helps.