I also don't see the dovetail body piece (10- ASSY-DOWN STOPPER DO(OR) 80581-E4100) below the door striker. Not necessarily a must but definitely a help as it also can provide a little push to open the door and also help with the alignment of the door to the body.
As noted above, it's the alignment of the striker in relation to the door latch that is the problem. The rotating latch should never end up jammed against the striker or it won't be able to turn (rotate) and release. The striker on the body needs to be aligned so the round latch doesn't touch it's sides - only the lobe(s) coming out of the latch. The oblong lobe should contact the striker first and begin the rotation of the latch that's necessary for the door to close and reopen properly. When aligned properly, the round lobe rotates and comes to rest in that bottom groove on the striker when the door is closed. The lobe is the only part of the latch that should be contacting the striker. (There are two lobes - one with a rounded end - the other is oblong. The oblong lobe contacts the striker first (and from the factory has a hard-ish rubber covering which is generally non-existent in most Z's after 40+ years of use)) If you had x-ray vision, you could see all this first hand...
To recreate the factory oblong lobe covering, I use a piece of 3/8" plastic tubing first cut to length the width of the oblong lobe, then slit down the length of the tubing and pulled apart to create a "C" which can be slipped over the oblong lobe. This adds the width the factory intended and helps the door to close and latch smoothly. Research "Slamming Door Issue" for info.