Had a further look at mine, and on closing there is small initial resistance from that sliding guide/opening restrictor, before both doors, the big and the small one start to close.
Almost like built in hump or overrun in the linkage actually inside the door.
Maybe worth you taking that big door card off that has the speaker attached, and look at what goes on inside as you operate the door, for wear or mis alignment.
Is there any wear/slop in the hinges, as that may be inclined for it to swing shut with no effort.