Please follow this UNIVERSAL diagram which can be found on the Guides Page:
From your picture library you have the Yellow wire going to the Mono Jack connected to the (Sleeve) or ground instead of the Audio Tip lug. Reverse them.
As for sharing of “common grounds” there are many ways to do that which is why we have extra pads on the boards to suit any builders style. It will all work as long as ground is found to be shared from power to main board to wiring board and Jacks.