Wrong test URL

Dear All,
I created a course with Learnpress, and anything worked just fine until last week. Then, I observed a very strange behavior: for each test I created (as an example, please see http://www.psicoattivo.com/courses/emozioni-in-regola-2020/test/dalla-fisiologia-al-comportamento/) there is, in the “curiiculum” tab of the course, the right link. However, when you click on the “start” button, you are redirected to a 404 page (“Nothing Here! Kindly search your topic below or browse the recent posts). Looking at the URL of these pages, it’s like the first words of the first question have been incorporated (in the previous example, it is:
http://www.psicoattivo.com/courses/emozioni-in-regola-2020/test/dalla-fisiologia-al-comportamento/si-puo-ottenere-sincronizzazione-emotiva-tra-due-persone)

It seems like a sort of bug to me, but I am not an IT expert and I do not know how to fix it (given that I did not setup manually any link, I just assigned each test to the course). Could you please help me?
Kind regards

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