Reply to Maschine MIDI problems

I've been using my Maschine Mk1 as a MIDI interface for Logic, Maschine, Kontakt, etc. and this problem occurs on all of them. When playing notes on my keyboard (Yamaha P 85) random keys will become pressed in the software and continuously sustain until I press the key again.
I get the same problem whether it's Kontakt on my Windows PC, or Logic on my Macbook.

Here's how it looks, while not pressing any keys:


Any idea what might be wrong?