Inmunity and Conviction

[d2l]

How they work ?

I don´t understand. A monster is inmune if he has 100% or more resistance yes.
But.......

Zombie Hell 120% Cold Resist

Conviction slvl 28 ---- -150% Resists ----- remove Inmunity
.
.
.Conviction slvl 16 ----- -105% Resists ----- remove Inmunity

Conviction slvl 15 ------ -100% Resists ----- no remove inmunity

why conviction slvl 15 don´t remove inmunity ??
teorically

120% - 100% = 20 % So remove yes

Or is just more complicated ?

Then i make some modding with zombie hell resist

Zombie 100 % Resist Cold

Conv slvl 1 -----> Remove Inmunity

Zombie 105% Resist Cold

Conv slvl 1 -----> Remove Inmunity

Zombie 110% Resist Cold

Conv slvl 1 ------> No remove inmunity (WTF !!!!!?!?!??)

then....

Zombie 108% Resist Cold

Conv slvl 1 ------> No remove inmunity

Zombie 106% Resist Cold

Conv slvl 1 ------> No Remove inmunity


So wtf is happening in 100-105% range, the conv kill inmunes but since 106% the effect seems no work.

Im stuck ;)