So sometimes the attack will miss but will still inflict poison and/or bleed, I doubt this is intentional?
I've seen that bug, however it's pretty hard to fix. I'll try to tackle it down in the next release.
I kind of chalked that up to a glancing blow of sorts - enough to bleed a bit or introduce poison into the enemy's system, but not enough to count as a full hit point, if that makes sense. XD Still, odd, yes.