PEAP Protocol

Hi everyone, I have a little problem with freeradius 1.0.4. It's maybe something I don't understand but I really need help. With PEAP protocol, I have a user test with its own password. The first 8 packets are fine but as I send the 9th, radius says Length in packet header doesn't match actual length. Does it means that the length in the first packet (when I send a two packets certificate) is greater or less than in second packet? Or is just the header length in this very packet? Thank you four your help. Juan Daniel MORENO