From: https://forums.totalwar.org/vb/showp...20&postcount=3
Quote Originally Posted by Tellos Athenaios
There's this bug in Vanilla after 1.2 which disrupts a phalanx formation (you know these guys wandering off to somewhere completely different from where their target is?), and that's something EB can't fix. But there's a way around this: make the enemy attack you. You didn't have a charge bonus to speak of with phalanxes anyway, and this way the phalanx more or less stays in formation.
^^ Yep, that's me.