Stanford, Georgia and Oklahoma tumbled in both major polls, which were released Sunday.
The Cardinal (5-1) fell eight spots in the Associated Press and USA Today coaches polls. Stanford went from fifth to No. 13 after losing to Utah.
The Bulldogs (4-2) dropped eight spots in the AP poll and nine spots in the coaches poll. Georgia fell from seventh to No. 15 by the AP and to No. 16 by USA Today after getting beat by Missouri.
The Sooners (5-1) went from 12th to No. 18 in the AP poll and 10th to No. 18 in the coaches poll after its loss to Texas.
Meanwhile, Alabama (6-0) and Oregon (6-0) remain the top two-ranked teams. The No. 1 Crimson Tide received 55 first-place votes and the No. 2 Ducks picked up the remaining five in the AP poll. In the coaches poll, Alabama received 58 votes, Oregon three votes and No. 4 Clemson one.
In the AP poll, No. 3 Clemson (6-0) and No. 4 Ohio State (6-0) kept their spots. Florida State (5-0) moved up from sixth to No. 5 in both polls. In the coaches poll, Ohio State remained No. 3 and Clemson No. 4.
Missouri (6-0) was the biggest mover in the polls, climbing from 25th to No. 14 by the AP and entered the coaches poll at 14th.
No. 24 Auburn and No. 25 Wisconsin entered the AP poll, replacing Michigan and Northwestern. Missouri replaced Northwestern in the coaches poll.