1. To rule out a theme issue, could you try switching to a default theme like Twenty Fourteen temporarily?
You may need to reset widgets afterwards, so you may want to make a note of which are active.
2. Earlier, I thought you mentioned that you got rid of the date (year, month, day) in your URL structure, when you said this:
the only thing i changed is the structure of the url i mean:
before i use this structure:
https://www.existenz.it/2014/07/11/popsophia-e-poi/
and now i removed the date so it’s like this:
https://www.existenz.it/il-giovane-favoloso/
If your permalink structure change had been fully successful, then you would no longer see URLs like this one, which I got to by clicking the first permalink on your homepage:
https://www.existenz.it/2014/07/11/popsophia-e-poi/
This is why it doesn’t look to me like your permalink structure was successfully changed the first time around, and why I suggested you re-save them.
Since permalinks are not a theme-related issue, you may also want to try posting in the main troubleshooting forum where you may get other suggestions for how to get that issue fixed up:
https://www.ads-software.com/support/forum/how-to-and-troubleshooting