Pose Problem with Armature. HELP!!!

So, I have set up my armature for my character and weight painted/created vertex groups for each bone. In pose mode when I “pose” my character, the mesh moves correctly, but leaves something like an image of original position of the mesh behind. It shows up when I render, and even when I move my character manually in Edit mode, but is not an actual mesh. I thought at first it might be a mirror modifier, but I have none, just the armature modifier. How do I get this to disapear??? Please HELP. Thanks in advanced :D.