why my marveni units moved by it self to garrison?

[geri]

I think somehow they go into berserker's rage after the spell song of boars or whatever so it does happen quite often you need to make sure you have your units selected every turn.

it's early in the game and my commander is marveni chieftain, no spell involved i think. So far i have this problem with javeliner, eponi knight, and boar warrior. Barchested warrior not have this issue, but i can't be sure.