Add File/Folder not working

Hi,
I want to thank you for your work.
I’m opening this ticket because I’m using on my site your plugin: SP Client Document Manager Premium.
I added the standard shortcode to the desired page and it was working perfectly since the last days. The buttons for adding files and folders are not working and have a wrong redirect link that leads to the page itself without generating the popup to add the file itself.
The page is: https://studiocriscigandolfo.it/area-clienti/
The site is: https://studiocriscigandolfo.it/
Do you have any suggestions on what could cause the issue?

Best regards,
Carlotta Messina

The page I need help with: [log in to see the link]