I started a project and added a video FX. It's the Brightness and Contrast. I dropped it into one clip and the right half of the screen was FX'd and the left half un FX'd. I thought 'that's cool but I need the whole screen done.' so I deleted the FX. When I started going through other parts of the project I noticed that other clips had been affected so I took out the initial clip. When I put a 'fresh' clip I noticed that one had the half and half effect also. So I went to the beginning of the project and noticed that all on my clips had been affected.

WHAT HAVE I DONE???, how do I undo it, how do I get the FX on the whole screen of the one clip? Please help.