So I bought This product from you guys, I have a variable power supply I am creating, I have a 12 V output and a 0 to 30 V output I plug the small black wire into my ground as well as the big black wire, then I put the small red wire into the 12 volt output to power the supply and the small yellow to my positive output. I then put the big red wire in line with my output load. It doesn’t show current and voltage at the same time, and when it shows current it shows a very wrong value I can’t adjust, or just can’t adjust much. Is there a way to fix this so I can show both at the same time.