Why doesn't my tracklisting match?

How come when I want to find the track list of Lil Wayne’s CD Tha Carter III, a different website will have different song?well most are the same but some have more and others have less like 17 and 21, and some songs don’t even match up. I want to know what are the official songs of that album.

Answer #1
  1. Lil Wayne - 3 Peat (Produced By Cool & Dre) (3:19)
  2. Lil Wayne - Mr. Carter (Featuring Jay-Z) (Produced By Just Blaze) (5:16)
  3. Lil Wayne - A Milli (Produced By Bangladesh) (3:41)
  4. Lil Wayne - Got Money (Featuring T-Pain) (Produced By Play-n-skillz) (4:04)
  5. Lil Wayne - Comfortable (Featuring Babyface) (Produced By Kanye West) (4:25)
  6. Lil Wayne - Phone Home (Produced By David Banner) (3:11)
  7. Lil Wayne - Dr. Carter (Produced By Swizz Beatz) (4:24)
  8. Lil Wayne - Tie My Hands (Featuring Robin Thicke) (Produced By Kanye West) (5:19)
  9. Lil Wayne - Shoot Me Down (Produced By Kanye West) (4:29)
  10. Lil Wayne - Playin’ With Fire (Produced By Streetrunner) (4:21)
  11. Lil Wayne - Lollipop (Featuring Static Major) (Produced By Jim Jonsin & Deezle) (4:59)
  12. Lil Wayne - La La (Featuring Brisco & Busta Rhymes) (Produced By David Banner) (4:21)
  13. Lil Wayne - Nothin’ On Me (Featuring Juelz Santana & Fabolous) (Produced By Alchemist) (5:27)
  14. Lil Wayne - Let The Beat Build (Produced By Kanye West & Deezle) (5:09)
  15. Lil Wayne - Mrs. Officer (Featuring Bobby Valentino) (Produced By Wyclef Jean) (4:47)
  16. Lil Wayne - Misunderstood (9:52)
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