Not sure if your latches are like mine but the only adjustment I have is to move the rectangular catch gizmo in or out on the door frame. It sounds like you need to try and adjust the catch so that it pulls the door closer to the frame on that leading edge.
Is there any evidence of previous damage to that area? Do you use your lower leg to push the door in to ensure that it latches firmly? Some of mine look tightly closed but when I push on them with my leg, I will hear the click and know they are latched.
'07 Country Coach Allure 470 Siskiyou Summit #31578, Cummins ISL 425; 2014 Ford F150 toad; Air Force One Toad Brake.
Glen Allen, VA; Smith Mountain Lake, VA.