You have a similar set up to me mate, I've got an mvp2 I use for checking resistance, and a hcigar kf 3.1. It's possible the positive pin on the mvp2 has been pushed down so that it is not making good contact with the pos connector on your kayfun. I use a flat head screwdriver to gently tease the mvp2 positive pin upwards, going from one side of the pin to the other to raise it. Can't see your pics you attached above, I think you may have to use the Advanced posting option and attach them, maybe in the Manage Attachment section (I remember others having issues, but I use external hosting for images I post so not too sure on this).