When a single AI or a group is waiting on a waypoint with the next move-waypoint being synchronized with a trigger, they always start to rotate like a watch hand until they face a certain direction on the map (on Stratis it is the south west corner of the map, on Altis it is somewhere on the western edge of the map).

This can be very problematic sometimes, especially for guards that have to face north or east, larger groups that keep adjusting their whole formation to this changing direction of their team leader or units that interrupt their current actions because they prefer rotating.
Apart from looking weird. ;)