Servicedesk always change and record time of technician assignment to latest action

Servicedesk always change and record time of technician assignment to latest action

Hi,
Everytime I make change on a request ( change field, change of priority, or any field, close request) , system always make a change on time of technician assignment to the latest action time. this make my report about working time is not correct and ( from last assigned time to completed time)
Can you please check this bug, I using Servicedesk version  9.2 build 9223 and I did test with latest version, got the same problem

Updated by Tuan, Nguyen Hoang Huy on Jan 18, 2017 08:54 AM
Request Updated by Tuan, Nguyen Hoang Huy
Request Owner changed from None to Tuan, Nguyen Hoang Huy
Technician changed from None to Tuan, Nguyen Hoang Huy
ISREAD changed from false to true
Closed by Tai, Le Trinh Huu on Jan 18, 2017 09:43 AM
Operation : CLOSE , Performed by : Tai, Le Trinh Huu
Updated by Tai, Le Trinh Huu on Jan 18, 2017 09:43 AM
Request Updated by Tai, Le Trinh Huu
Time of technician assignment changed from Jan 18, 2017 08:54 AM to Jan 18, 2017 09:43 AM