Soul Tether Belt Is Not Working, Please Fix!

I am using a Blood Mage and trying out the Soul Tether Belt and the excess leech is not being applied to my energy shield. I'm not sure if the life remnants are messing with the calculation, but it goes from 1000+ life per second to nothing and my energy shield doesn't get that recovery when I reach max health.

do you leech more than the 5% es degen from the belt?