2001 Hyundai Elantra Drivers side Rear has stiffened up

My left rear (drivers side) has no bounce to it at all. All other 3 corners have normal bounce. Now it handles bad and bounces me in the seat on any bumps. Can a shock/strut (I'm not sure what this car has in the rear) freeze up like that? I might add here the car was raised up on a mechanic's lift one day priar to this occuring (the kind you drive up and over like going up ramps and down the other side straddling your underside) and the drivers side was WAY higher than the passengers side. The mechanic then lowered it, backed up a bit, and raised it again (still leaned but only a little). I can't see any visable damage under there from just what I can see but any ideas on why that side in the rear is suddenly stiff like that? No shocks/struts have been replaced on this car yet. Can shocks/struts do that or is it likely something got bent/damaged/etc. From the lift? I'm just looking for the short amswer here. Thank you.