NZXT fans speed control issue

I have NZXT AER RGB 2 fans with NZXT RGB & Fan Controller. My fans are connected via 3 fan channels.
I bought PRO version, detected fans’ speed, on 2 channels everything was good but on 3rd it wasn’t. These fans are always are at 550-600 rpm. Can’t even make them 0 rpm. The worst part is that these fans are on my AIO. Is there any way to fix it?

One of the developers has to look at that, I’ll ping @Heal-Bot so he will see this once he’s on duty.

Hello! Any update on this one?