Season Points Projections Source?

I’m just wondering where the point projections come from for FantasyPros, and why there’s a disconnect between point projections and expert rankings?

For example, Cooper Kupp projected ~30 points more than Justin Jefferson on average but Justin Jefferson is ranked higher on average.

Deebo Samuel is projected more points than Davante Adams, Stefon Diggs, and Ceedee Lamb but barely anyone ranks Deebo above those others, so why does Deebo have the higher “average projection”?

They come from inside the minds of some human beings, just like you and me.

They should be treated as the stuff of fantasy and dreams.