1200GXman, anything is possible. It could have come from the factory with a default (new cars have an average of 20 defects). Or your shop could have mismatched one of the four wheels, or their supplier did it to them.

When a problem arises, it can cause problems making assumptions, best to test the easiest things, then the most likely things, then proceed to more difficult tests ... until the cause of the problem is found of course.