LastActivityOn field in the SysActivityLog table the actual time seems off

Hello,

It is 11:18 and in my SysActivityLog table for a specific user I see the time in the LastActiviyOn to be 11:48 and up for today…

The time on our server is the same as mine, 11:18. So from where does it take its time for the login?
And why it does not take the server’s time?

Thank you.

Pierre