Touchpad sensitivity has been addressed in an early update so if you are noticing this with a brand new SKULPT we would first recommend updating your unit.
The touchpads work though ‘capacitive sensing’ - detecting the presence of your touch in a similar way to your smartphone/tablet screen. If you are having difficulty using the touchpads, it’s likely to be to do with either your skin contact or the power source.
As there are a couple of places on the synth other than the touchpads that will trigger sounds, ensure that you are just touching the pads (and not the left-hand side of the SKULPT or the underside of the keyboard)
Ensure your hands are clean and dry and that you are not wearing any gloves.
Try powering the SKULPT from an alternate power source. Powering from batteries and listening on headphones will isolate the synth from any other equipment that may be affecting the SKULPT. If this fixes the issue, try unplugging any other equipment that may be affecting the power, such as your laptop charger.
Try sending MIDI to the SKULPT to identify if it is an issue with the touchpads.