Okay so to add to my bug report.
Bingo was set to 0000, and I was planning to manually turn it of when I reached desired fuel quantity.
Today I used the fuel dump again but I set bingo to 4000 to warn me when to stop dumping. But the bingo limit automatically turns of the fuel dump. But when I turned down the bingo quantity again I could continue dumping.
It might be something where the bingo/fuel system doesn't recalibrate when you refuel? Though I did not try to fuel dump again after my landing and refuel. I have neither tried to turn the bingo knob after the dump switches getting stuck.
The two fuel tank lights start lighting up after a while even when I have refuelled to 100%. But you might know that.