Some years ago I found a bogus registration (Dem of course) on the rolls at primary time. Address didn’t exist. Fortunately at the time the State Senator was Republican. I called his office, and the registration was gone at the time of the general. The people signing folks in to vote didn’t seem to care.
Until it was needed and then removed after being used & tabulated, at any rate.
That's how some states had more votes than voters on the rolls.