launchkey midi signal


I am a new cubase user and recently i installed my launch key 61 into cubase. so far so good. after some vids on youtube google hel etc etc everything works. Keys, Pots, Faders. All good. Except from one thing that i don’t seem to find some help for. ever since i added the launch key incontrol into Devices>remote devices>Mackie HUI> midi output.
The midi output signal meter on my transport bar is showing constant midi activity even when am not doing something. Every second it pops goes down again pops goes down…

Is this something normal or can i do something about this?

Thx in advance