One way you can check if he is actually there is to shoot at him. If you get friendly fire damage, something is very wrong and he is actually flying. If the shots go straight through, the client just got very confused and didn't bother to even snap him back in place from time to time. (The bots are controlled by the server so they will always know where to aim.) I checked the map and there aren't any barriers that he could have been standing on there.
CC_Warden_Kip | CC_Sentinel_Kip | CC_Guard_Kip | CC_Zweihander_Kip | CC_Marksman_Kip | CC_Pavise_Kip | CC_Peltast_Kip | CC_Marauder_Kip | others...