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Huh. That sounds like a bug actually! You can move units as many times as you want! Thanks for playing - gimme more feedback if you have any!

I only hope there are MORE units and twists added!  If it happens again I'll try to give you any relevant info.  

A potential clue, at least one  of the times it happened, when highlighting the stuck unit, I was getting the unit info of another unit somewhere else on the board.

Can multiple units share the same space?

Multiple units should not be able to share the same space, no. I'll look into that other bug.