@Mr. Deez
In fact, Trump has won more votes than GOP Senate candidates in almost every state.
Here are the vote totals (as of this afternoon, according to Decision Desk HQ) for GOP Senate candidates and Trump in the six states where the pre-election polls showed a competitive race for both the presidency and the Senate:
Michigan:
Trump: 2,640,185
James: 2,633,014
Arizona:
Trump: 1,402,431
McSally: 1,383,947
Georgia
Trump: 2,438,206:
Perdue: 2,439,193
North Carolina:
Trump: 2,732,084
Tillis: 2,640,381
Iowa:
Trump: 896,294
Ernst: 864,113
Texas:
Trump: 5,866,712
Cornyn: 5,931,119
The same pattern plays out in red states where polls only showed close Senate races (but ended up being blowouts):
Montana:
Trump: 320,682
Daines: 310,924
South Carolina:
Trump: 1,362,954
Graham: 1,347,167
In two blue states where incumbent Republican senators were running, one Republican lost while the other Republican won:
Colorado:
Trump: 1,305,460
Gardner: 1,367,685
Maine:
Trump: 356,182
Collins: 412,217
It’s not surprising that Susan Collins was the only Republican Senate candidate in the country to run far ahead of Trump. In 2008, she ran 40 points (on net) ahead of John McCain. In 2016, she’s running 19 points (on net) ahead of Trump.
You're not accounting for the fact that some voters only vote for president and are passive about other races. For example, it wouldn't shock me if Biden got more raw votes than the Democratic Senate candidates in those states as well. Looking at the percentages is more telling.