While I probably haven't found all the problems yet, one immediate one is that you have swapped c1 and c2 on the insert schematics. In the Fritz schematic c2 is 47nf and is the coupling capacitor to the volume control, in the inset schematic that is c1 and c2 is the power filter cap. In breadboard c2 is the 47nf ceramic connected to the volume control and the source of the fet as it should be and c1 is the power supply cap. On pcb c2 is across the power supply causing the extra rats nest lines and various shorts (as that is also how the copper is routed) and c2 is connected as the source coupling capacitor. So the rats nest lines are likely in the correct place (although there does appear to be a Fritzing bug as well because if you eliminate all the connections the rats nest lines remain ...). I'll poke at this some more tomorrow.
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