If it's only at the back, move the striker in or out. It looks like it needs to go in, but it's possible that it needs to go out if the latch is only closing on the first detent. Actually, take the striker off (mark position first) and hold the door shut and see how it lines up with the front fender. The striker should only be used to adjust how far in or out the door is at the rear. All other door adjustments should be made with the striker removed.