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Had something go weird when the computer cast Heedless One. I attached the game log. On the battlefield the computer had : (1) Joraga Warcaller (with two Presence of Gond auras and no +1/+1 counters) (1) Imperious Perfect and (3) 1/1 elf warrior tokens.

Computer turn 6:
00:00:14
Computer played Forest8
Computer cast Heedless One (At this point showed that it was a 14/14, which is twice what it should have been)
00:00:40
Computer attacked User with Joraga Warcaller(2/2)
User blocked Joraga Warcaller(2/2) with Myr Enforcer(4/4)
Computer assigned combat damage from Joraga Warcaller(2/2): 2 damage to Myr Enforcer(4/4)
User assigned combat damage from Myr Enforcer(4/4): 4 damage to Joraga Warcaller(2/2)

The Joraga Warcaller died and went to the graveyard, but for some reason the three elf warrior tokens and the Imperious Perfect died as well. The Heedless One dropped to a 1/1 since it was the only elf left (which implies that it isn't double counting the elves, as it seemed it was when it was first cast).

Had the same thing happen with Jagged-Scar Archers, after casting it and tapping an elf it killed all of my other creatures except Joraga Warcaller.