Bug on GAC, final blow as timer runs out

Something strange / buggy happened. I hit Jabba on GAC with JMK. I had killed 4 out of 5, battle was on auto. At the last second, after I had seen the message that I lost, killed 4 and clicked submit, my toons delivered the final blow vs krssantan. I got just 4 banners out of the battle, but Jabba is marked as defeated (with 1 attack)

There is no way I have just 123 banners after one-shotting 3 teams (if you include the 10 for first attack). See attachment