Hey guys, looking for advice here. I purchased a dropped out rear subframe from a 2017 GT PP mustang for the center section and knuckles. In the process, I purchased brand new hubs from LMR to replace the used ones from the mustang. I noticed they had a little "give" once they were all mounted up... I could grab the rear wheel and I could make it wiggle ever so slightly. Well, I took the car out for the first shake down runs and I've got maybe 5 miles on it now. She's back up on jackstands and I noticed that the rear wheels are way loose on the hub. I can grab the wheels a move it almost a solid 1/4" left-right & up-down. Not good.

What would cause the hubs to loosen up like this? All bolts are torqued & tight, brakes, park brake are all operational and look correct. They are the same on the right and left side.

TIA!