(CNN) A discrepancy in the number of votes cast for governor and senator in Florida in Broward County is raising questions about the ballot design there, as the vote-count margin in the two big races continues to narrow.

A CNN analysis of votes cast in Broward County suggests that ballot design could be responsible for a substantial difference in the number of votes cast between the race for governor and the race for senator in Florida, meaning thousands of voters there may have missed their chance to weigh in on the still-undecided Senate race. The placement of the Senate race on the ballot could have made it easy to overlook.

Overall, as of Friday, nearly 26,000 voters in the county had cast ballots for governor but skipped voting in the Senate race, according to a CNN analysis of precinct-level results.

Broward County became infamous for vote-counting problems during the 2000 presidential recount.

Broward is a Democratic-leaning county. Among those who did vote in the Senate race there, 69.1% backed incumbent Democratic Sen. Bill Nelson, while 30.9% backed Republican Gov. Rick Scott. Gubernatorial candidate Andrew Gillum topped Republican former Rep. Ron DeSantis in the county by a similar share of the vote (68% for Gillum to 31.3% for DeSantis), but Gillum earned about 10,000 more votes from the county than Nelson received.

Read More