Sorry, I don't understand the issue you face.
Please explain the issue step by step.

You create new user ? which profile ? (please post screenshot)
Then what are you doing ? What do you expect ? What do you get ?

sorry,,
No, my user administrator is old as shown in image

but after nearly two minutes ago I wanted to display my project (nothing appear in Description window) (no project selected)! as shown in image

or I want to display the activities in planning also (nothing appear in Description window)! as shown:

or i want to show my activity (as selected"التدقيق" ) nothing appear in Description window (no activity selected)! as shown:

also the same issue when i want to create new project or activity!
conclusion :In the beginning of opening the user there is no problem, but after a few minutes have passed, data loss occurs!

But I still don't understand the issue you face.

If you want some help, please expain step by step your issue.
Describe a test case.

sorry i edited my massage ...please check it

If I make a summary :
You connect as admin.
All works fine during first minutes.
After few minutes, when you click on one item to display its detail, there is nothing displayed.

Is that correct ?

If you then disconnect, do you retreive correct behavior (during few minutes) ?

yes it correct... I retrieved the correct behavior (during few minutes) when i disconnect my user and reopened it again

I'm almost sure this is not due to projeqtor code.
So you must have so external plugin that interact with your web pages.
Try to disable all plugins or try with another browser without plugins