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As my name sake says, when using a local receiver the leakage is going to provide your strong signal regardless of whether the TX Antenna or load is plugged in,
verified in your comment about touching the BNC Outer / metalwork increasing local strength.

If you have being at this for a week, To save getting the runaround you need to measure and follow that RF level from the PA stage, through Switched LPF's and finally to the terminated Ant jack.
If you do not have a QRP Power Meter then build yourself an RF Probe. An example of such a detector is an option in the QRP Lab's Dummy load, two components. Take a look at that section of the build instructions else Google will provide numerous examples
In your use its purely for indication, no need for accuracy. Any rectifier type diode will do and something anywhere in the range of a 103 / 104 capacitor from the junk box / laying on the bench.

Else, bullet points to think about.
None of the 6(?) bands get results?
On the LPF's check the continuity end to end to verify the enamel has being removed from the wire, and properly tinned / soldered.
Check the jumper positions and Ant Out connections are correct on the U3 / Relay PCB's
Multiband operation selecting the correct LPF in U3 setup menu

As a final last resort sanity check remove the multi band SWT PCB and set the U3 up for mono band, for it's correct operation, then troubleshoot the rest.
Not sure on anything = photo's......

Alan