Rear Passenger Door Won't Fully Close

[huesmann]

2012 Mazda5, rear passenger sliding door won't fully close. It closes and latches in front, but the trailing edge of the door doesn't shut flush with the back of the body. I can bump the door with my body and it goes kinda flush, but no latching and I can pull it back outwards (but the front stays latched).

Any ideas? Thanks.