Thanks a lot for the answer.
I've tested the issue on the following browsers:
Chrome
Ie11
Edge
Debugging the site is empty, there is nothing. I reinstalled the system in the hope of adjusting. First, it was impossible to run fopen on the log, but it is now empty by changing zpdata permissions. Unfortunately I can not see server errors being on a free site (encrimi.altervista.org). If needed, I can give you access credentials.