Yeah, masters was massively outspent. Mitch really did a bad job of resource allocation this cycle, including his personal beef with Trump. Right now Lake is running 4.2% better than Masters - just looked.
Mitch sabotaged as many of the (R) races as he could, especially the MAGA ones.
Or the other possibility is that they do not want a Trumper in the U.S. Senate and are cheating him. The endless counting, mail in/drop box elections may be a clue.