This claim is false. There were not more ballots than registered voters inMilwaukee.
Milwaukee City Wire subsequently issued a correction stating that, since they published the first version of the article, the county updated the voter registration data on their data portal and updated voting tallies for precincts, which showed more people did not vote for the state than the number of registered people. However, according to USA Today, "An archived version of the county election results showed the wards in question had accurate results posted as of 9:48 a.m., hours before the first version of this story published. The timestamp also confirms this on the county website, which notes it was last updated at 3:56 a.m."
Moreover, the Wisconsin Elections Commission has emphasized that it’s simply not possible for more ballots than registered voters. Wisconsin allows people to register at the polls on Election Day. Milwaukee Election Commission Executive Director Claire Woodall-Vogg told the Milwaukee Journal Sentinel, "it wasn’t clear where the numbers in the article came from. She said the city and county reporting software reflect different numbers than what City Wire published."