Looks to me as if you did not check to see if everything was clear inside before moving the slide.
Been there , done that. They look like the tracks for the draw that were ripped off when the slide tried to close the draw for you. Look carefully and you should find some small screws either inside the track or on the floor somewhere. You will need them to re-attach the draw track. Good luck and welcome to the wonders of RV life, Hank
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Hank & Lynn
2007 Cougar 290RKS, E-Z Flex, 16" XPS RIBs ( SOLD
.. Gonna miss her ... looking for new 5r)
2004.5 Dodge 2500 QC, LB, 5.9HO, WestTach gauges, Ride-Rite