[Bug] Tree Limb Smash does 13 Damage

I was doing the "Black Oaken Heart" adventure today and my warrior unexpectedly died. Looking in the Battle Log, I saw that he got hit by Tree Limb Smash for 10 damage after Reliable Mail reduced it by 2. The picture of Tree Limb Smash shows a base damage of 11, and there were no other damage modifiers applied aside from my armor. I pulled up the console, and sure enough, the base damage for the card was displayed as 13. Here's is the excerpt from the battle log, followed by the console output:

Battle Log:
Mageslayer moved.
Wotota crushes Mageslayer with a mighty tree limb!
Reliable Mail reduced damage to Mageslayer by 2.
Mageslayer took 10 Crushing damage.

Console:
BATTLE LOG: Scenario=Dense Wood,Room=BLK2 (TheSench),RoomID=415444,Msg=The active player is now Gary
BATTLE LOG: Player=Gary,Scenario=Dense Wood,Room=BLK2 (TheSench),RoomID=415444,Event=PlayAction,Action=Tree Limb Smash,Instigator=Wotota,Targets=Mageslayer
BATTLE LOG: Player=Gary,Scenario=Dense Wood,Room=BLK2 (TheSench),RoomID=415444,Event=TriggerSucceed,Trigger=Reliable Mail,TriggeringActor=Mageslayer,AffectedActors=,TriggerType=PreDamage,TriggerLocation=Hand
BATTLE LOG: Scenario=Dense Wood,Room=BLK2 (TheSench),RoomID=415444,Msg=Mageslayer took 13 damage
BATTLE LOG: Player=Gary,Scenario=Dense Wood,Room=BLK2 (TheSench),RoomID=415444,Event=TriggerSucceed,Trigger=Martyr Blessing,TriggeringActor=Mageslayer,AffectedActors=,TriggerType=PostDamage,TriggerLocation=ActorAttachment
BATTLE LOG: Scenario=Dense Wood,Room=BLK2 (TheSench),RoomID=415444,Msg=Detaching and discarding Martyr Blessing from Mageslayer
BATTLE LOG: Scenario=Dense Wood,Room=BLK2 (TheSench),RoomID=415444,Msg=Mageslayer died

 

... time to learn to read, I suppose.