Team Totals vs Game Totals

[austintx05]

I notice in comparison a lot of the team totals when added up are off of the posted game total.

For example, tomorrow's game...

Philadelphia Phillies
J. Moyer
OVER 9.5 -103
UNDER 9.5 -107 Philadelphia Phillies
OVER 4 -114
UNDER 4 -102 New York Mets
OVER 4.5 -124
UNDER 4.5 +108
10:10 AM 902 New York Mets
OL. Perez

Team Totals add up to 8.5 which is 1 run under the 9.5 posted game total.

Are books leaning under? What can you make of this? I notice it happens quite a bit where the differential is 1 run and sometimes 1.5 runs.

Thanks.