Any Residential Electricians in the House?

Here's the deal, I bought a Murray 200 amp panel a couple years ago with eventual plan to upgrade my service. Hung it on a 3/4 plywood base in the basement finally this spring. Just today I jumped the mains from my existing panel. 100 amps (fused in old box) coming across the 2 AWG jumpers and into the mains of the new panel until it comes time to connect the new mains to new service. Unable to do otherwsie because my new main wires won't fit the small old meter base.

Here is what I've done.

Black/Red -Main hots into main leads
White -common into isolated bus bar
Ground -no ground wire at this time as old panel is using ground/common combination

There are ZERO WIRES outletting new box currently. NOTHING connected but the power in.

I am pulling 34 volts across the unconnected panel ground to each hot, zero volts to isolated bus.

Why am I pulling voltage across an unconnected point?

Could a damp basement have caused this? This makes no sense to me otherwise.
Author: Rattle Trap