How come you decided to tighten the nut.
When I first installed ( not my current garage) every 6 months I would check the nuts. not knowing any better I would retorque them to spec. a few years went by and I picked up my fathers 2500. one of the wedge anchors popped a chunk out of the concrete.
I didnt fix the floor since i was moving a couple months later. When i setup the car lift in my new garage, I poured a brand new floor with very large pads for the lift. 4x4 x 2 ft thick.. i purchased my wedge anchors from rey jurgans ( spelling may be off ) they specialize in automotive lifts. when I asked them the proper way to check the anchors; they say torque once and then just make sure the nuts are snug from there on out.
If you keep re-torquing them i guess over time it draws the taper through the collar compressing the concrete
with that said is the hole all the way to dirt ?
if you get a new anchor is it snug in the hole, or does it have a case of the weeble wobbles ?
I would epoxy in a piece of threaded rod / call it a day