Damage is very low before enemy is pinned

Recently (probably after last patch) I started to notice that I don't deal damage until I pin the enemy. Only damage from my mirror copy and ballista totem is registered. Once I pin the enemy I start dealing damage.
I am using only Siege Cascade as a damage dealing spell.
This is my passive tree loadout:


Here is an example of how this works right now:
https://youtu.be/2KYM_NJInwY

I play mercenary witchhunter. I could think that it's just that I have tiny damage without pinning, but it says I have 180k dmg per shot, and I hardly push 50k before pinning. It's either not registered properly, or for some reason reduced a lot. I also have Witchbane + No mercy nodes in my ascendancy.
I remember playing a few days ago and it was dealing damage before pinning fine, much much more than it is right now.

P.S.
After I pin the enemy first time, and its duration finishes, I start doing around 200-250k dmg per shot. It's only these shots before I pin the enemy first time deal around 15-20k dmg max