Priest Galakrond bug

Was playing Priest and had gained a copy of Warrior Kargath Prime. He attacked and killed a minion gaining me 10 armour, my opponent spent the turn clearing him and dealt no face damage. However, when I played Galakrond, instead of gaining the additional 5 armour, I lost all my armour. A visual bug then showed that I had 5 armour but my opponent dealt health damage whenever he attacked, costing me the match as I effectively lost 15 armour

(Edit: While I know this should be in the bug report forum, I have no option to post there, so this is the only other place I can)