FortiGate and FortiManager not retrieve configuration

Hello all community,

I have some issue in FortiManager, 

FortiManager and FortiGate connection is established and working correctly, after update the Fortigate in 7.2.6, the change made localy in FortiGate is not retrieve in FortiManager (7.2.4, 

there is no link issue, no compatibility issue.

please any one have an idea for this scenario

Thank you