I just noticed several of my Lv10 boss cards are sitting at 100/1100 exp. Does that mean if you fill it to full, it will level up to lv11?
It will not. That is just the current expbar of the card at lvl 10. Its most likely there in case you over exp a card it wont go to waste if the case of a higher lvl would be possible in the future. But as to this point in time lvl 10 is max and rest just goes to waste