Sorry to hear this. Obviously contact your seller. They need to make good on this.
There is also support on the ASM web-site and i definitely would contact them as well, they can talk you through this and answer the questions you have.
I’ve not heard of this before.
Sounds like a manufacturing issue. i have no knowledge though on the specifics of the pads on the HSD.
Is there a calibration for the pads ? I don’t think so. On page 10 of the System Setup menu, is calibration for the Ribbon and Wheel, but that is only for the HSK, i don’t think there is an equivalent on the HSD. There is a settings page, for the Pads or Keyboard on page 3 of the System Setup, which may change things, but it still sounds like you have a problem. That lets you change the velocity curves for the pads.
There’s a chance that this might be a break-in issue, ASM support can tell you this, that it will go away after you use it for a while – hopefully it is.