Only thing I can think of is this;
Some critter was on your sensor ( or it slipped on it's mount somehow ) and it overfilled the sump. The higher level in the sump is giving the return pump more to work with and it's filling your tank with more volume than normal, so the overflow is high
And now it's taking forever for the extra water to evaporate, or the new sensor position is keeping it full when you plug it back in until the float turns it off ?
Once you get your level back to previous, recheck your sensor level
Good luck
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