What was problematic about the 1876 presidential election?

The united states presidential election of 1876 was one of the most disputed presidential elections in the history of America.
The problem with the election was centered on 20 electoral votes that were in dispute.

Samuel J. Tilden of New York had outpolled  Ohio's Rutherford B. Hayes in the popular vote, and had 184 electoral votes to Haye's 165, with 20 votes uncounted.

These 20 votes were in dispute in three states namely Florida, Louisiana and South Carolina. Each party reported  its candidate had won the state.

After a bitter legal and political battle, the 20 votes were awarded to Hayes , giving him the victory.

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