Dodgy 1spot power supply?

[NJE]

I bought a Toneman 1spot power supply to run a few pedals but it is making a hell of a noise, or at least I think it is.

 

I play through my laptop, and plugged direct into my interface there is no noise or hum. I add in a battery powered Boss OC2 and there is no noise.

 

I use the 1spot with my tuner and another pedal individually and I get an awful hum, it’s worse with the Korg Tuner. As soon as I touch a metal part on the pedal or Jack plug or my bass it goes away.

 

Is this a dodgy 1spot, dodgy power in my house, or do I need to buy a full on isolated power supply to sort the problem out?

 

Thanks in advance.