I can think of no other possibilities. Strange indeed.
Unless the one tank's water line is plugged up.
That has happened to me with boats. One boat I owned, I had to tear apart the water pump and found a white-milky substance fouling the diaphragm so much so that it would no longer pump.
Not sure if it was residual goop put on the hoses to clean/seal/lubricate them for assembly, or something from the tank itself. Never found out what the goop was.
So there may be some residual pieces of material of some sort that could clog up a hose.
Not saying this is the problem, but it does happen.
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The only thing that works on a RV is the owner...
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