Please include  the column headers in the EXPORT option on the CLIENT app.

--Unable to view column headers of Exported Data. View logs >> Network Threat Protection >> Packet logs.

--When checked with NTP >> Traffic Logs same things were hapenning.

--Tried checking with All the Logs of Network Access Control and also Logs of Client Management same thing was hapenning unable to view column Headers.

--Tried Exporting logs from virus and Spyware and PTP any logs was able to see the column headers.