Kinda weird - I'd bet that there is a problem with the light bar. Have him pick Dr. 1 on the DMD and hit the escape targets on the right side. With Dr. 1 selected, he should light 2 letters for every one hit. If that's the case, the lightbar under the DMD is wrong. Probably crossed wires someplace. If not, possibly an in-line diode is bad. Use the built-in diagnostics and confirm that the wiring wasn't messed with. I've seen stuff like this a lot!
Good Luck!