Sorry should have mentioned that. Theres nothing stopping it from closing, as I can push down both sides and they sit flush. Its just the middle at the front that wont push down in to the lock.
Also I've tried using a screwdriver as a pretend hook and that wont lock in even when I push it all the way down. Which is strange as the parts all move albeit not very easily, but enough to move with force which I can imagine is how they should be?