Is anything binding it (them). I have a cabinet door in below my television, that I have to make sure doesn't open and put the slide in a bind.
Also you don't have slide locks in place, do you?
It may help more, if you state make/model of RV you have...and what slide(s) this is happening on?
2011 Flagstaff 831 RLBSS
They say weird people are just wired the wrong way.