If Biden Won Legitimately in 2020 Then Why Did 18 Out of 19 Bellwether Counties Vote Trump Shouldn’t Have for Sleepy?

Translate:

There are 19 counties in the U. S. which from 1980 to 2016 cast their majority votes for the eventual presidential winners in every election during that span of time, and in 2020 all but 1 of the 19 voted for Trump, therefore, since Sleepy Joe supposedly won that election by 7 million votes, shouldn’t the vast majority (if not all) of those bellwether counties have voted for Biden, why do you suppose they didn’t?