Our 2015 FK had a similar problem with the big slide. We had it adjusted and the tiles replaced and, thankfully, haven't had the floor marked up again. Once in a while, maybe one in 10 times, the slide will not close properly, leaving a gap at the top. Running the slide out and back in has fixed it so far.
Does make me wonder about the longevity of those slides. I cringe a little each time I run it in and out wondering when it might leave me stranded somewhere.
Ty & Deb Montag
2015 Jayco Seneca 36FK
2014 Honda CR-V toad