Airstrip shows 2/6 but i have zero planes

[True God]

After a multiplayer attack when i lost 3 bombers. The third one was lost right at the end of the attack. After that the airstrip shows 2/6 even after reloading the game. I can only train 4 planes now and it should be 6.

 

[Berend_War]

True God not upgrading a airstrip by any chance. The retrain option still uses the upgrading airstrip.
When you use the finish now for crowns. The airstrip upgrading won't finish the plain it's training.