You're playing a tier 5 alliance and using their map. Tier 5 and up has attacker bans.
What tier are you in? Bans have been a thing in AW for a long time. In lower tiers they are random (though I don't believe they happen in really low tiers), but they are deliberate as you move up.
Chavez is banned on my side but the other team has Chavez as an attacker