[2020] BUG:Recalibration library for pistol from 14% to 15% not working

Hi
I am unable to have 15% template for pistols
i have 4 gun with 15% weapon damage for recalibration and after selecting any pistol with 15% and pressing X button i get back to this screen in the image. I can add template for other weapons but not for the gun.
I don't lose the gun, but i am stuck.
I also try to recalibrate the exotic gun with 20 times and the higher % was also 14%. Something wrong is with threshold.