How does a candidate legitimately lose 20k votes?

Not being a conspiracy theorist, but wft is up with NY's senate election? Sare's votes went down while Schumer's and Pinion's went up. Vote count going from 50,408 down to 29,754 is highly suspicious.
How does a candidate legitimately lose 20k votes?
How does a candidate legitimately lose 20k votes?
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