Cover art for two unrelated songs are in sync, how do I fix this?

[AC Question]

Cover Art For Two Unrelated Songs are In Sync

I have a problem. My Lg Optimus phone has a preinstalled app to let me play music. However, I have two songs on my phone downloaded. If I change the cover art of one then the cover art of the other also changes. This only happens with these 2 songs and not with any others. How do I fix this?