Mugabe is a controversial leader, and people think he is using force and other illegal methods to make sure he wins the election, even if more people vote for his opponent.
One of the things Mugabe is said to have done is put lots of places to vote where his supporters live, and not many where the MDC's are.
This is one of the main reasons why so many people are still queuing, but because Mugabe has lots of control over the courts, his government may appeal against the decision.