What makes it an anamoly?
Maybe as far as r&b goes but during that time period r&b was mainstream.
Like I stated, plenty of other albums during that time sold just as much. Below isn’t even the entire list. It wasn’t unheard of for artist to have big block buster albums like that during that time. Confessions was HUGE though.
10. 1997 – Shania Twain – Come On Over – 33,500,000
15. 2011 – Adele – 21 – 30,140,000
18. 1997 – Céline Dion – Let’s Talk About Love – 29,800,000
27. 2002 – Norah Jones – Come Away With Me – 23,900,000
32. 2000 – Eminem – The Marshall Mathers LP – 22,900,000
38. 2002 – Eminem – The Eminem Show – 21,400,000
41. 2000 – Linkin Park – Hybrid Theory – 20,800,000
42. 2015 – Adele – 25 – 20,410,000
49. 2000 – Britney Spears – Oops!… I Did It Again – 18,935,000
59. 1999 – Red Hot Chili Peppers – Californication – 16,270,000
60. 2002 – Avril Lavigne – Let Go – 16,220,000
61. 1998 – Madonna – Ray Of Light – 16,000,000
63. 2008 – Lady Gaga – The Fame / The Fame Monster– 15,820,000
66. 2004 – Usher – Confessions – 15,500,000
68. 2000 – NSYNC – No Strings Attached – 15,300,000
70. 2004 – Green Day – American Idiot – 15,250,000
72. 2006 – Amy Winehouse – Back To Black – 14,900,000
74. 2000 – Enya – A Day Without Rain – 14,430,000
80. 1997 – Spice Girls – Spiceworld – 13,950,000