Crystal Reports Total Count Not Tallying to Group Sum

Message

   hey all,

Need a lil help ere..

i have this formula as below:
if {@differtimeinMIN} >= 0 and {@differtimeinMIN} <= 15 then
    1
else
    0

so replicating the above formula to specific groups like 0-15,15-30,30-45,45-60,>60

The Question is :
My Group Summary doesnt tally with my Count of records

say Total Count on Orders = 695 used basic count function
but results from groups
0-15=209,15-30=190,30-45=82,45-60=65,>60=176
Totaling to 722

Any Suggestion or explanation to how am i getting such untally value?

Help is kindly appreciated

Regards,
Terri