I am having issues with one of the opponents in my current 100 player game. He is hitting my forces with single tactical bombers or groups 3-5 and he is not suffering any return damage to his units, while my bombers are practically melting away (we both have them at lvl. 6). He launches strike at my airfield catching my bombers on the ground refueling and his 5 bombers destroy 10 of mine, 18 of my bombers follow them, catching them on the ground and do no damage. Is there something I've been missing with my tactics or is this some kind of bug?