I not sure about other country, it happened when I tried to destroy Japanese tanks. I only killed one guy with my M1 Bazooka, but the replay of penetration shows I killed 2. After I killed 4 crews, the replay shows that all 5 crews were died. I am pretty sure there is still one crew alive, becuase the tank did not explode and it was still able to shoot me. Sometime the last crew was already left the tank, but the relay still shows that there are 5 died bodies in the tank.
Is this a bug or something?