One of mine also has an issue where the grey knob that secures the hood in place turns on its metal rod, leading to the knob no longer being straight when tightened, which means it no longer fits the indentation in the flap. This means the flap can no longer close as tightly as it should and thereby possibly not reach the catch.
Likely fixable with the aforementioned catch adjustment, just a different source of the problem. The flap will stay "further out" on the sides though. (Unfortunately I haven't found a good fix for the knob turning when it shouldn't)