Is there a buff which instantly reloads the unit's abilities? Because I just made a battle with an orc squad using the song which casts random buffs/debuffs (with the unofficial fix) and my soothsayers were able to cast the Loki's touch 2 times in 2 successive turns. And yes - I am absolutely sure of it.
I've encountered this with Loki's Touch, too, but I have no idea what causes it. I didn't use that song.