A strange issue on PL/SQL and Crystal report

A Crystal rpt file (version=8.5) is called through CRAXDRT.DLL by a VB6 exe. This rpt file has two linked sub-reports. There are 3 Oracle stored procedures behind the main report and two sub-reports. I found that the stored procedure behind the main report is always called twice within the same Oracle session when the VB based report is run. Did someone else ever meet the similar situation and know why?
Thanks in advance!

Thanks for your response. In fact, the stored procedure for the main report is responsible for querying data and inserting them into a oracle table (report table); the stored procedures for the sub-reports only summarize the data stored in the above report table. The main stored procedure are not called in the stored procedures for the sub-reports. I attach a field consisting of the current Oracle PL/SQL session number and system time to each recod in the report table. So I can trace the process of inserting data by the main stored procedure and found that the main stored procedure actually insert the same data twice within the same Oracle session.
Thanks

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