The Blue Baron wrote:
In game 201206 on turn 7 I was hit directly from behind with no deflection. One of my chits was an engine hit and the damage was actually applied to my engine. I know the damage should have hit my tail since I was hit from behind with no deflection.

This game wasn't one with a tail gunner firing on you was it? If so they fire with deflection even if behind you unless they are flying directly away from you.
That's going to be my guess.