I kill the ET, but should not

[Hardlead]

It has happened two times where I have been able to understand whats happening.

Scenario;

I park the tank or ATG behind something that is almost to tall to shoot above to reach the ET.

I back away one meter at a time, until I judge that the round will clear my cover. I fire, and get the familiar explosion in front of my gun.

To close, the round struck the ATG emplacement or rail road station platform.

BUT,, the ET explodes, i get no kill (thats OK) but the ET has no killer in stats, just KIA. Im the only one firing at the Et.

Something to look at for 1.35?