I have these mags, they do the same thing in my madbull DD receiver.
They seem to be thinner than the stanag mags. and the window on the mag itself is to shallow not letting the catch engage fully.
I just put a few strips of felt/velcro on the inside of the magwell on each side to keep the mag from wobbling around. I have no issues now,they lock in place and don't wobble.
But that being said,it makes inserting mags a bit harder with the extra friction and mags wont just fall when pressing the button.
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