Statistics errors

Hi,
in attach you can find two file .pdf (report generate with netflow analyzer software v.5.). I try to explain the problem:

1) in the file filiale_1.pdf, the MAX traffic value is 1,22 Mbps. This serial line has a PCR (Peak Cell Rate) of 768 kbps and for this the value is wrong; the max peak cell rate should be 768kbps maximum.

2) in the file filiale_2.pdf, the MAX traffic value is 4.13 Mbps . This serial line has a PCR of 2048 kbps and for this the value is wrong too; the max peak cell rate should be 2048kbps maximum.

Looking both report, i think that the average traffic should be correct (i can see this with the show interface on both router).
I specify that the wan interface is a serial line (2mbps) while the lan interface is an ethernet or fastethernet interface (10/100mbps).

Thanks in advance for support