No, lug 1 is supposed to be connected to ground. This is a standard volume pot arrangement, lug 3 goes to the signal, lug 1 to ground, lug 2 creates a voltage divider that attenuates the signal. If you disconnect lug 1 from ground, your signal will have no ground reference, which can cause problems (popping on bypass, among other things).
A screwy ground in the circuit wouldn't mess up your bypass signal in any case.
Your problem must be elsewhere. It is usually be easier to debug if you look at the
schematic, though trouble with bypass suggests that that it's not the actual circuit that is buggy. I would start by double-checking your test box, particularly the switch.