There's a discrepancy in several key states that warrant investigation
Typically there isn't a major difference between full down-ballots and ballots that simply vote in the presidentials, but in some places that are major discrepancies far beyond typical expectations.
Liberals and Conservatives have different opinions as to why that could happen (or it could just be an unusual statistical anomaly) but it certainly warrants investigation.
Ideally a large randomised quantity of those president-only ballots should be audited to confirm they're all actually authentic and can be tracked to an actual voter who disregarded the state-elections.