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Sounds like the bed thermistor wires are crossing, or shorting on each other, or at the bed, if they come into contact with metal, or a PCB through hole, which has a metal ridge, they can short to each other.
If shorted, they would trigger a MAX temp, as a short would be 0 resistance.
If a wire comes unplugged, or is disconnecting, it would be open, or full resistance.