Edit:
When in real-time updates, there's nothing strange.
But with manual refresh, there are those strange stuff and the interval is dangerous, like ever millisecond.
Even though, the server is fine, speed is good, resources consumption isn't affected..
This log is happening with a particular website. (Our main production)
So it's targeted ? but I don't understand, how is it possible that plesk is showing stuff in the log and not being recorded in the log files...