As 7 p.m. approached, signs of trouble emerged in what was a virtually glitch-free Election Day in Broward and Palm Beach counties — prompting behind-the-scenes scrambling, frustration from political insiders and concerns that conspiracy theories could erupt. Shortly before the polls closed in Tuesday’s Democratic and Republican primaries and nonpartisan elections, the people most anxious to learn the results — candidates, political operatives, consultants and news reporters — started logging on to county elections offices websites. When the polls close, ballots already tabulated from early voting and mail voting are normally posted immediately.