My Chrome was recently updated to v.70. Tested a project a while ago and it worked fine. Tested it today in Chrome and after I clicked my Submit button and my drags changed to their Drop Incorrect state they would randomly shift like 8px left and 8px up. Sometimes all of them do it, sometimes 1 or 2. Very sporadic.
Also tested in new versions of Edge, Firefox and IE and I'm not seeing it happen there.