Connecting transformer with single input and secondary two outputs
Assuming that the two secondary windings are identical, you need to connect them in parallel. To do that, you connect together the two terminals that are marked with dots and use that point as one output terminal. Connect together the other two terminals and use that point as the second output terminal. The PCB layout appears to use the two dot-marked terminals as the output terminals. That is wrong. The diagrams below show the parallel connection schematic and PCB layout.