Dodgy repro Lego switchgear - park light on/off?

Anyone else bought any of the repro Lego (i.e. T3/V50 etc.) switchgear over the last few years that may have come via Stein Diunse/Gutsibits and found an issue with it, in that, lights when switched to ‘off’ on the switch are on and when on ‘park’ on the switch, are actually off. I have spent ages trying to work it out, even to the point that I have resoldered two wires in the switch but no difference, and I really don’t want to do more than that. Seems to me the switch inside isn’t correct. Anyway, anyone else had the same problems and solved it? Not quality issues like solder falling off etc. but the specific lights ion and off problem. Thanks in advance.