Quote Originally Posted by cyberVIP
(...)Regional(from local MICs) Towered AFE CAN be upgraded(retrained). In this case parameters break (36->24 men and +3 bonuses to melee, missile attack values)
Sorry for English, hope its understandable now
I think the reason for this is simple: you started the game with the Huge setting for the size of armies. But now you have a smaller setting. This means that when you upgraded the unit, it applied the new setting, thus reducing its number of men and animals.

Recruit another unit in your current setting, then change to a larger setting and upgrade the unit in Kart-Hadast (it will benefit from the city's large temple and blacksmith). I bet it will have the opposite effect that you had with the AFE unit you mentioned.