The Texas Supreme Court halted a lower court ruling that ordered polling locations in Dallas to stay open until 9 p.m. as confusion over polling locations affected much of the county on primary election day.

As Texas voters took to the polls on Tuesday to cast their ballots in the state’s hotly watched congressional primaries, up to 90% of voters in Dallas initially went to the wrong voting location, Dallas County Judge Clay Jenkins told the Houston Chronicle. The high court’s ruling could delay vote counts and spur litigation over the election’s outcome.