Needs to be diagnosed of course but chances are you either have a bad lift cylinder on one side or a broken "tension rod", which helps not with lifting but alignment at the top goes up and down.
So just replacing one lift cylinder may not fix the problem--it would only be a guess. I suppose if you were handy and patient you could swap the cylinders left and right but that's not all that easy to do, as hydraulic lines are involved as well.
Answers
So just replacing one lift cylinder may not fix the problem--it would only be a guess. I suppose if you were handy and patient you could swap the cylinders left and right but that's not all that easy to do, as hydraulic lines are involved as well.