Hmm, more gap than mine has for sure. Can the door be bent in more?
I'm not engineer but is seems to me one possible reason for this is that the bottom and top of the opening isn't on the same plane somehow, like one is squished in (technical term.)
In other words if the latch has to pull the center of the door in a lot, its sides could bow out?
Perhaps a ruler or straight edge could answer that.