Layers are auto duplicating when initially release left click then move layer again

may sound weird but that's what is happening, started today can't figure out how to stop it. When I move a image onto another for a layer and release the left click on mouse, the layer is auto duplicating but is not creating a new layer and i can't get rid of it, like it's perm in the background layer. So when I move the layer the auto duplicate remains - attached screen shot to help explain better. I did a all tools reset but didn't fix the issue.