Weird grep style

I have a weird problem after using Grep styles within a paragraph style. I had a style that changed the font and colour of the expression - ellyBelly Publications. 

Now, however, whenever I type a word with a y in it (including ellyBelly), it does not display the y, then applies the style for all the next characters - the letter y will not type at all!!!!

HELP! I dont want to have to redo all the frames again!