Soul Spring Eternal bug, CoC

I am not sure whats going on but I have Cast on Crit at quality 20%. at 100 spirit cost, a 10% reservation efficiency would bring me down to 90 cost, but for some reason it is at 91 spirit cost.

Additionally when I take Soul Springs Eternal, which has a 50% meta gem reservation efficiency, my spirit cost is 63???

10%+50% = 60% efficiency, Should it not be 40 spirit cost?

yeah im pretty sure im not calculating wrong