Incorrectly displays page generation time

I noticed that the most recent version of the counter incorrectly and randomly for each visitor shows or does not show the page generation time.
It also gives the average page generation time if you make a sample of visits for 1 month, but does not give out for any other period, for example, today or a week ago.
Where to fix it?
Screenshots attached

I understand that the topic is not interesting and only I have a problem?
Contact someone who has the same problem
Thank you