My slides did the same thing.....ripped the flooring and the other 2 slides was shreading the carpet. The cause was the screws in the bottom of the slideouts were drilled in at a angle and the wood screw heads were not countersunk which was providing a sharp edge dragging along the floor everytime the slide went in/out. The damage from this will happen quickly. My kitchen flooring ripped/gouged on my second trip.
With your slides out, look under the bottom from the outside. You will see the screw heads along each side. If they are not countersunk, that could be your problem.