Hot wire showing hot with no neutral or ground

When wires are in close contact the live ones induce voltages on the ones that are not powered. We call this a phantom voltage The voltage is real but there is no potential or current.

There are volt meters that have low impedance and eliminate this phantom voltage, most pros don’t use low z meters because the low impedance makes for inaccurate readings and we usually want to see the real values our meters are showing because other issues can be hidden with low z meters.

To prove you don’t even need to have a complete circuit use your meter ac volts plug 1 probe into a receptacle on the hot (small slot) and hold the other probe and you will measure a few volts.