My slide rides up on a plastic ramp which allows for the slide as well as the couch to come in without touching the floor. One of the ramps did break and it caused the slide to scratch my floor. Had the ramp replaced and the floor touched up and no more problem. That may be the issue with yours or the rollers as mentioned earlier.
2014 Kodiak 279 rbsl
2017 Ford F-150 King Ranch V8
Equalizer hitch
Ford integrated brake controller
2004 Travel Lite 23S Hybrid Travel Trailer ( previous trailer )
1998 Viking Popup ( previous trailer )
No substitute for experience