Nice to see you!
Before I go into any kind of exposition, are you saying you don't understand the polling or how they made the decision or what precisely?
The polls are a transparent fiction on everyone. Seriously - it really doesn't matter in terms of the national championship whether Georgia was ranked 5th, 6th, or 25th or not at all. It does matter in terms of which bowl game they're going to play.
This is one of the quirks of our system: a team MIGHT gain an advantage by LOSING a game IF - key point here - OTHER TEAMS also lose their games. Winning your game that may require another one puts you in control; losing means you lose control, but you may benefit if circumstances break your way.
This has been a sticking point even before the CFP committee. In 2012, Alabama beat Georgia in the SEC championship game by four points. During the regular season, Georgia beat Florida head-to-head and won the division and right to play the extra game. When they LOST, Florida (who only lost to Georgia) moved ahead of Georgia in the rankings because the better team lost the extra game. Georgia, yes, got punished for playing an extra game.
If you're thinking, "Man, you Americans do some stupid things," you are 100% right.
And that's one of them.
It's a bit different with the actual playoff but yes.