If the threaded retainers are Nutserts or Rivnuts, they may have been installed incorrectly. In my experience, in thin sheet metal, Riv-Nuts do a better job while Nutserts are better in thick panels. In any case, each must be pulled tight and installed in the correct size hole to prevent the inserts from spinning. This is one time that de-burring a hole is not recommended- the hole edge burrs help keep the insert from turning. A dab of epoxy doesn't hurt either.