In the two screenshots I have attached (I am the vikings), showing the position at the end of my turn and then the position at the start of my next turn after the AI has moved, the AI has split its force making a knight move (in chess terms) with all its units either left or right. Shieldwall (14) has been highlighted as a reference point.
Normally to do a knight move as the player the unit will path forward one space then over a diagonal, unless the square in front of the unit is blocked, in which case it will path over a diagonal and then forward. When taking the "usual" route the unit will end its move facing at an angle to its original facing. Maneuverable units can then use their free rotation to point forward again, but undrilled infantry is stuck facing at an angle.
In the AI's case, the AI can execute a knight move by pathing diagonal and then forward seemingly at any point, resulting in the above situation where all its units have moved forward and over but still have their original facing (except for the dismounted lancers at the right, who pathed the way the player normally does and are facing at an angle accordingly - probably because of the rough ground now that I think about it).
