Upgrade Animations being used at random

[HerrDave]

I've hit a wall.
My tank models (Panzer & Sherman) have a model-breaking problem which I cannot pin down.

For some reason, the Upgrade animations will play at random while attacking - for example, a Panzer III will sprout extra armour and a longer gun for the duration of the attack, but then go back to normal for the next three shots.

Also, the machine gun attack is going off at the same time, despite being an entirely separate animation.
What on Earth is going on?

Models attached for those brave enough to troubleshoot.

 

[Illidan(Evil)X]

There's a spelling error in one of the Sherman's attack animations.

Anim "Attack One Upgade First" {
    ...
}

The Panzer seems to work fine though.

 

[HerrDave]

Ach!

Though I never expected to say this (ever) - Thank you, Illidan!