I sure hope you got this taken care of by now. But in case you haven't or if someone else has the same/similar issue, all I can say is:
Let's start with a quick question - "Did you buy this used?" - Definitely sounds like at least an Open Box. DM10 should sound really good right out of the box - and play pretty darned well too.
We can further tweak the experience to match our own style of playing using the trigger settings in the module.
Check that all of the cables are hooked up to the correct pad/trigger.
I don't have that newer DM10, so yours has a completely different module than mine, so I can't give step-by-step instructions, but you'll want to begin with a Factory Reset of the module. If it is new, there's nothing to lose from that.
After the RESET, it should play really well like I said above. Especially if all the cables are hooked up correctly.