I see what you mean but with the weights weighing 42 lbs. each I can't see as how they would fall off. Also see where they can move if not filled to capacity. I'm in the same boat as you not having a iMatch so I'd probably fill up the inside one first then the outside one.
They’re definitely not going to fall off. If you only have one or two weights mounted on the lower bracket and the tractor takes a good sway the weights will tip back and forth quite a bit.
My work around will be to place a piece of thick rubber tubing (cut the width of the weight) into the round area at top of the weight slot. This should raise the weight just enough to let it hang and not sway.
It’ll be several months before I can purchase iMatch and any 3 point implements. Have plenty of backhoe work to keep me busy in the meantime.
Will more than likely strap my weights together to keep them from moving around.
Picking up 6 more 70 pounders next week. Will post a photo after they’re installed.