It seems to be a problem that is present only when the autosave option is enabled. The fact that undo will not repair the distortion might have to do with V-ray being installed on your machines - when autosave occurs, v-ray updates the materials (and maybe other settings too) making impossible for the undo to repair any recently created damage.
I disabled the autosave function and everything runs smooth now. Curios if this problem is present on machines that do not have V-ray installed.
Also, just as a fun fact, as random as the distortion may seem, I once traced the moved element back to it’s original place, moving only along the axes and the distances were very specific, no odd numbers or anything.