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Those are curious and interesting BPF plots.

It looks like 80m-40m is "sort of OK" but with some unexplained variation. You also get TX power output on those bands.

It is as if there is a problem somewhere in the 30m/20m LPF and that problem may also be affecting the other bands somewhat.

The first suggestion regarding LPF problems is always to check and make sure that the inductors are properly soldered, and that no residual enamel insulation is blocking connection. That is best done with an ohmmeter, measuring the resistance from one side of the inductor to the other. Probe the solder pads, not the copper wires, as you may get fooled otherwise. Your specific problem may be elsewhere but it is good to do this step just to be sure.

Make sure that no solder splashes or stray wire bits are fouling that LPF.

Inspect the inductor L509? which feeds the PIN diodes un that LPF. Make sure it has not been damaged and is soldered properly. An ohmmeter should show a low resistance, perhaps an ohm.

Inspect the PIN diodes that are part of the 30m/20m LPF. Are they oriented correctly? Are they properly soldered in place? What voltages do you measure on their leads when 30m or 20m is selected? What voltages when 80m-40m is selected?

Those steps should get you an answer or at least bring an answer much closer.

73 JZ KJ4A?