On September 11, the Iowa Supreme Court refused to put the Libertarian candidates for U.S. House back on the ballot. See this story. The party nominated three candidates for U.S. House by party meeting. The county and precinct conventions that nominated them were held on the same day, but the law says they can’t be on the same day.
UPDATE: here is the decision in Gluba v State Objections Panel, 24-1426.