Welcome to the FTF community Brian.
Have you field stripped and cleaned and lubed the Mini yet? Does the trigger group/housing feel loose? Sometimes they can wear and loosen a bit.
But, I've never heard of this before, so I think something's not right with the aftermarket folding stock.
If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen. ― Samuel Adams