Firewall Analyzer to extract large raw firewall log?

Firewall Analyzer to extract large raw firewall log?

I searched a raw firewall log from 01-Jul-2018 till 11-Jul-2018, i attempt to extract the log as .csv files.

However, the csv files only extracted period are just 05-Jul-2018 till 11-Jul-2018, any idea how to get the complete logs files?

Thanks.

Regards,
Clare