Sometimes the Kontakt patch receive the midi note but no sound

Context :

win11

cubase 12 pro

kontakt 7

3 CSS patches set to midi channel 1, 2 and 3

expression maps to change the midi channel with the articulations

sometimes, randomly, I press a note on my physical keyboard, the note gets transmitted to the correct Kontakt patch (light blinking) but it does not produce any sound. I tried to move cc1 and 11 and the same thing, no sound.

i tried to press all my keys and there is one or two note that does trigger the CSS patch and produce sounds but only 1 or 2 note, that’s super weird

I try to press on the virtual keyboard and no sound. It seems random