question about a Temporal Rift problem

I have a small question regarding Temporal Rift and support according to. Because I have 105 will and have divided it like that
just got 105 will to spend

ARCTIC ARMOR is 30 will
CAST ON FREEZE + COMET + DRIVE IS 60 WILL

and now I wanted to put in Herbology in addition to the Temporal Rift, that's 15 wills to activate. When I put the gem in I'm left with 0 wills but Temporal Rift doesn't work, I tried combinations.

like Arctic Armor and Herbalism that is 30+15 = 45
and Cast of freeze 60
Makes a total of 105 points and somehow Temporal Rift works normally despite 0 in reserve
What am I doing wrong? I would be happy if someone could explain this to me so that I can see where I did something wrong, or say it's a bug in the game I got
If anyone else had this and managed to solve it, I would be happy to know how can you get it to work
around it?