Having owned two Popups, over a number of years, here's what I found with similar issues.
Popups have thin frames and one has to be careful when extending the stabilizer jacks. It doesn't take much to tweak the frame enough to cause door issues.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package