Locked steering wheel moved/rotated after replacing struts. Is this okay?

So I hired a mechanic to replace my front left strut. I parked the car in a lifter and left it with the steering wheel perfectly aligned straight then i turned off the car. When the strut work was done i went back inside the car and noticed that the steering wheel rotated a decent amount to the left from its original position and note that the steering wheel was locked since the car was turned off. Is this normal? Does this cause damage to my steering wheel? Is it still okay to use? Thanks!