Bear Trap of Skewers + Call of Steel Interaction bug

When using Bear Trap of Skewers, the impales called by Call of Steel deal significantly less damage. This is compared to the normal impale triggering by hits.

Video: https://www.youtube.com/watch?v=lp-_wFuS5t0

I don't think Call of Steel should only cause that amount of impale damage, seems like Call of Steel treats the impale as if it only lasts 1 hit.