If each of the state legislatures and state governor submits a different slate of the electoral college, then the Congress decides which slate to be adopted.
But, since Republicans control the Senate and Democrats control the House, there's a possibility that....
...the two chambers disagree. In this case, VP Pence, in his role as Senate president, could try to throw out a state’s disputed electoral votes entirely (Ned Foley, a law professor at Ohio State University).
Did you know, Americans, 【appx 24 million】—one of every eight—voter registrations in the US are no longer valid or are significantly inaccurate (Pew Research / in 2012).