Unwanted chord, here and there, while driving UJAM Silk v2 in Instrumend mode

Hi there

It happens with Cantabile also, so I am not sure it is a Scaler issue

I use Scaler to send chords in the UJAM guitar Fretboard area (right), and I am quite sure they don’t hit the other areas on the left due to MIDI Polysher

Then I start to hit the notes in the left areas, paying attention to NOT hit the 3 Key Switches buttons that trigger a strumming, but here and then a chord is played ruining my arpeggio, why?