Automatic Date & Time update results in wrong time on Linux Machine

Question

I am using Fedora 29, with kernel version 4.19.15-300 on my laptop. It has been a while that I see the computer clock is about 6 to 7 minutes ahead.

Pondering why, I checked the status of chronyd (systemctl status chronyd.service) and I see the following log message repeated every time the machine is resumed from sleep:

chronyd[812]: Forward time jump detected!

Also, the output of chronyc source is an empty list. Does this mean that there is a problem in the configuration of NTP on the machine, and that the time has never been actually synchronized? Could anyone help me to fix the issue?