Blood Golem active drain ability doesn't seem to work right

Not sure if maybe the aoe is just super duper tiny or what.

It is supposed to triple damage when against a solo enemy. Seems to do way less damage than ability of my hero that does same damage even against a single target. Half the time it seems to do no damage.

I am thinking it is counting all enemies on the screen but the aoe is barely above melee?

Tested this by removing all minions. 3 bears spawned not near each other. Blood golem went to 1 bear. Did barely the same in auto-attack damage to the bear.
Yet auto-attack is 180 damage and the ability says 285 but triple against one enemy.

Should have done 855 damage. My bloodsurge is doing more damage and it is at 137 + 344 = 481

Not sure what is going on with it.