This seems more incorrect connections than the bug/feature. In pcb you have two shorts between 5V and ground (and the dc dc inverter is incorrect as well!) The first one is here on the RPI connector:
The yellow (top side) trace connects 5V to GND on the connector. Same on the DC-DC converter:
the brown (bottom trace) is shorting 5V to GND. After that, the DC-DC converter is incorrect in that it takes an input from 6 to 12V on Input (which is currently fed from 5V) and produces 5V on the output. It looks like the DC-DC converter should connect to the barrel connector, but it doesn’t seem to and the 5V output from the DC-DC converter can’t connect to the 5V supply on the RPI because it would be a conflict. Hope this helps.
Peter