Raining Excavators

Hey, has anyone else hit this amusing glitch?

I had it happen one night while digging for Cid's Mop at the Excavation Site. I'd selected two spots and set the men, crossing paths with one of them on the ladder. When I selected the next spot, the man went right past me, up the ladder, and then jumped down from the second level to the selected spot. The next two men did the same, so it looked like it was raining men.

This apparently can happen sometimes. As yet, I haven't managed to figure what triggers it, except starting at level two and descending the ladder. After that, it seems random.

pb
Little Pond