The numbers aren't the same. They don't come from the same source. So they all need to be on your tax return,
A 1099-DIV reports money that you earned from owning stock in a company. If you own a percentage of a company then they pay you out a percentage of their earnings. Sometimes they pay you a portion of the capital gains they earned (which have to be separate on the form because they're taxed at a different rate).
A 1099-B reports money you earned from stock you sold. The sale can earn or lose money. These are capital gains that you earn directly and not as dividends.
All of this shows up on your tax return on different lines. But - unless your broker is doing something shady - it's not showing up on your return twice.
@retasker
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