What you were expecting to happen, and what actually happened?
I webbed Dark Master so that his summoned Thrall would be level1. He was level1 but his stats were not level1 stats.
What are the steps to make it happen again?
Have Dark Master be webbed when casting his Cat O’Nine Tails. Or probably any other summon. I think the 0 magic caused by webbed might be why /shrug
Do you have any screenshots or video you want to share with us so we can see the problem? Attach them to your post!