The decay pot lug 1 does connect directly to ground
The depth and attack pots don’t, attack is connected to ground via R19 If you look at the schematic you’ll see how they’re wired and where you should expect continuity
If I understand correctly you are saying that all pots don’t have much range across thier rotation and they go from min to max very quickly?
Double check you have the correct value pots in the correct positions there’s not a huge difference in pot values but if you put a B2K were a B10K should go then the range would be affected
As Barry says check all component values and orientation it’s very easy to use an incorrect value in a fairly high parts count build
This is what I use to check resistor values