Kemper Player MC6 Pro midi problem

Hi, i notice the indicator USB Device MIDI In is always on when I use usb-a (Kemper) with usb-c (device) mc6 pro. Because of that I have problem with a midi clock tap msg. When I use usb-b (Kemper) with host port mc6 pro works properly. Is that normal? Is it a bug from Kemper or MC6 pro?

thanks