The news (heard it on NPR) briefly touched up on this issue. Apparently some of the states allow election date (11/03) registration, or some other form of late registration, allowing the local residents to register late and cast their ballots. Some of these counties are in heavily republican favored states.

The registered voter number you've listed is most likely as of early November, which does not necessarily reflect the final number of registered voters.

So no conspiracy there.

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2003 X5 4.6is Estoril Blue, acquired March 2018
2013 128i M Sport 6 MT Space Grey daily driver
2010 535xi 6 MT Barbera Red