My First Bug – How to fix it?

I have 2 different images (side by side) that needs 2 different links. It was working great at first then all of a sudden the program thinks they are the same, so when I replace the link of one image it also replaces the link of the other image, when I delete one link it also deletes the link of the other image and so on. I tried very hard to solve this but cant seem to do it. Anybody know how to fix it? Thanks.