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F81 Barrel connectors are not signal directional , ground blocks are not signal directional.
Bad F81 barrel connector , bad ground block.
I think you are using bad coax , connectors that are not put on the coax correctly.
The foil shied and shied wires can be pushed in and touching the center wire of the coax , look inside the connectors on the ends of the coax , this cause bad signals.
The foam that surrounds the center wire can be stuck to the center wire , look inside the connectors on the ends of the coaxes.
The center wire or foil shied and shield wires of coax can be broken.
A nail or screw might have been put through the coax.
Or the coax can be bad because that is what the coax wants to be and is.
Use new coax and coax that is known to be good.
If a splitter is being used that is not a HFS splitter , and the preamp power supply/power injector is on one side of the splitter and the preamp unit is on the other side of the splitter then a splitter that passes power through the splitter needs to be used.
The HFS splitters pass power and have a diode that passes power one way so there is no power back feeding.
When using a VHF antenna and UHF antenna a real and actual UVSJ needs to be used.
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