Drop Pod Strenght in Final Stand is 0

[fsx]

Scenario Final Stand at Archeron
In turn 14 the reinforcement arrives. The drop pods have a strenght of 10.
In some of my games the blue drop pods have a strenght of 0 at the begin of the 15th turn.
I spotted that at the end of the Ork turn 14 the drop pods had a strenght > 0. The strenght lowers to 0 between the end of the Ork turn 14 and the begin of the Imperial turn 15.

I am able to switch these pods. Then, after the switch, they have strenght of 1 and I could not switch back.
The red drop pods hold the strenght from turn 14 to 15.