Ohm 64 Some buttons acts like Ctrl instead of Notes

Hi

I never solved this problem and i start to wonder if there is a problem with my ohm.

When using FLstudio i want to use buttons (1-63) to mute/unmute tracks. The problem is that it works fine with some buttons (toggling on/off) but with some it acts like a (press/release - press = track muted / release = track unmuted.

What i tried :
- Reset to factory default (latest ohm editor version).
- install/uninstall editor
- set all buttons as notes / set all buttons as ctrl
- changing range of messages with "quick assign" = > problem persist but on different buttons.
- Tried with all usb ports.

No problem with max/msp or live. Im experienced with FLstudio , all midi settings are ok.
Bonus question : is there a way to have visual feedback with this DAW ?

Thanks a lot for your help
Riz