Od- Either you can adjust that problem out, or there is some wear (or maybe in initial defect) in how the catches grab the frame to hold the hatch shut. If its adjustable to a non-problem you can probably figure it our by examining the mechanism of the catch. If it can't, you can probably figure that out by examining the frame and its position when almost closed and looking at how the catch actually captures the frame part.
This is an unusual problem, and I'm sure can be fixed w/out breaking the bank.
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project