Sometimes if you have one stab jack cranked down considerably tighter than the others, it can cause slides to bind up and not close right. To test this, retract all the stabs/levelers and then run the slide out, and back in. (Do not take your finger off the button until the slides is fully retracted). Of course many times a slide retracting crazy does require an adjustment.
I started with nothing, and still have most of it left
2001 Jayco KIWI 23B
2003 Jeep Grand Cherokee 4.7 AWD