Celticjim:
As far as I know from iyt, it works like this:
If you have less than 6 moveable pieces on a board of open fast espionage (i.e. excl. hq and bombs) and you move one of them between two bombs of your opponent placed on the bottom line, then, within the next turn, you should be able to move your piece back to field it came from. For example: your opponent has a bomb/or hq on b10 and on d10 and you move your piece from c9 to c10. In that case, due to the forced movement thing, you should be able to move your piece back to c9 in your next turn.

Unfortunately, I can't have a look at your posted game in the bug list, as it's obviously still running.
But, in the bug reported by pauloaguia it seems to be the case like I desribed above.

Hope that helps.
Greets, Michael