Copy of my other response:
TheRageMonkey, the guy you are talking about is CA, who never implemented soft collisions and never made proper pivot setting for phalanx targetting. Player can do the same with any units since infantry can't stop other infantry. Phalanx will just to try allign own center vs center of unit they are trying to fight with so if that "center" is not really where its supposed to be, stuff like that happen.

There is also a case where formation is disabled, player phalanx cant be used there but AI often glitches and tries to still turn it on, then it turns off, both several times within a second, which also gives them infinite charge bonus.
But again, that issue comes from how CA made the game, not with how it was made in the mod.