Help Wallpaper Moves after Unlock

[drabkin95]

Hey y'all, I've had my Samsung GS3 for a few months, and everything was going great. But a couple weeks ago, my friends were messing around with my phone and set a different image they found online as the wall paper. Ever since I changed it back to the wall paper it was previously, every time I unlock my phone the wall paper will move around and adjust size. It will go back to exactly how I set it in a second or two, it's just really annoying. For example, I'll unlock it, it will start in the correct place, but then it'll shift to the left, then back to the center but it will have increased in size, then it'll go back to it's normal size but shift to the right, and then it will be normal again. Just wondering if there's an easy fix to this I just haven't thought of. Thanks for the help!