The pot needs to be in the Gain pads. Also you need to have a 10K resistor and a jumper in the volume (level) pads per the directions.
Whether you hand wired the pot or not it does not matter you still need to do what the final directions say above. The pot must be in the gain pads and you need to solder a fixed 10k resistor between “Volume” pads 1 and 2, and a jumper between pads 2 and 3.
This is why I was asking for an updated picture because I cannot see what is happening.