Did Charlton Muck Up?

1965 - SB P5 (Variety 1) - MS-64 (30$) - MS-65 (100$) - MS-60 (800$)
1965 - SB B5 (Variety 2) - MS-64 (12$) - MS-65 (25$) - MS-60 (175$)
1965 - LB B5 (Variety 3) - MS-64 (12$) - MS-65 (25$) - MS-60 (175$)
1965 - LB P5 (Variety 4) - MS-64 (110$) - MS-65 (350$) - MS-60 (-)

what's going on? for those who have the 2013 (purple) book its on page 63

why is MS-60 so off? how is it worth substantially more than MS-65