Maybe a bug. On dragon blades. So I have. Pearl ice darkness distorted dragon blade and tried each one.

I was trying to complete all the guardian challenges in that one room. And when I got to the dragon challenge I went and grab all my dragon blades. But it all of them did negative dmg and started healing the energy dragon. Can someone else try this and see if it's a bug or is it just me or can explain what's going on please. Thanks.