What you were expecting to happen, and what actually happened?
When dealing damage with Rowanne to a troop with frenzy, it should add 1 attack but it added the exact damage to attack.
What are the steps to make it happen again?
Just damage a troop with frenzy with Rowanne (it happened more than once)
Do you have any screenshots or video you want to share with us so we can see the problem? Attach them to your post!