Possibly the bushes,alternatively if the bush mounting brackets were taken off to do the bushes at some point they may not have been refitted properly.
The bush mounting brackets are suposed to be tightened up while the car is on the floor with its weight on the wheels.In this way its supposed to align itself properly. If they were tightened up in the air it can be wrong.
Possibly it has had a bang on one of the wheels and bent the axle?
Good luck with it :thumbs: