false triggers on different inputs

I have a new 56input MD assembled by dmitri and I noticed that when I hit my snare rather hard then sometimes a false trigger is detected on the next input. I unplugged the ride cymbal from that input and still I get triggers there when I hit the snare hard (and it's on a single snare stand btw, so no XTalk).
What can that be? wrong wiring?
What can that be? wrong wiring?