What you were expecting to happen, and what actually happened?
I was fighting against Humility using Rowanne. When I fired her Humility took damage, but didn't trigger her Virtue. She didn't have any problem triggering on damage from other sources.
What are the steps to make it happen again?
Probably fire off Rowanne against Humility with no armour. Maybe another split damage troop? I haven't tried it.
Do you have any screenshots or video you want to share with us so we can see the problem? Attach them to your post!
The first two enemy troops were Humilities, the third one I think Draakulis, but I'm not sure, the last one Sorcerer Hero with Creeping Death. Screen taken during Rowanne cast.