Why Would Crystal Reports read more than it prints

Hi everyone,

In my case My record selection is based on the following:

{FACILITY}=1

And {payment_code} In ["110","111","112","115","116","117"]

And {service_code} = "COPAY"

And {date_of_receipt} in [{?From Date} to {?To Date}]

And yet for any parameter selection set crystal reports would read - say - 1000 records but prints only 25 records, the question is if the records found according to the selected values from parameter and the record selection formula, is only 25 records, then why would it read 1000 records? what is the reason? and how to avoid it?

Thanks in advance!