Hey guys, scoring question for you. I used the last buck posted as a sample to see if I would score it correctly and he came up with 89 6/8. I used the info below and came up with 86 1/8. What am I doing wrong?

Right Left
MB18 1/8 MB 18

G12 2/8G11 7/8
G25 1/8G2 4 3/8
G31 2/8G3 1 7/8

H13 5/8 H13 5/8
H23 1/8 H2 3 1/8
H32 7/8H32 6/8
H42 H4 2

IS 13 6/8

Total 89 6/8