Im actually surprised I don't have this issue, especially since I store it for months on an Unleveled spot. I wonder if it happens for those who over torque the stabilizer jacks? Not pointing fingers or even suggesting you guys are, just saying it does happen.
My uncle had this exact issue (Maybe not as severe, since his door would close), but only when setup/camped, otherwise the door closed just fine. In his case, he was over cranking on his front stabilizers (If I remember correctly). It didn't take much for his travel trailer to get out of wack. He didn't like that he had more movement in trailer when releasing pressure on the stabilizers, but the door would open/close much easier.