There is one time, my Kadmos is the Chosen one with ward and some buff.
And every time he got attacked on the board, he gains +1 Armor to himself, which I don't know it's a bug or not. He is later on sitting with 4 armor.
My Opponent concede after realize it, very funny to see.
Haha this happened to me too, although I'm quite certain that it's a visual bug. It seems like you're getting armor, but when your opponent attacks into it it actually retains its original 1 armor. Also similarly happens when you've changed Chosen Ones but Kadmos keeps buffing the old one...