Variables doesn't work properly on a Quiz?

Hi,

I'm building a Quiz for my course, and i want to have a "small window" on each question that show me the status of my quiz.

I mean the status of my previous question if i did it wrongly or correctly.

To do so i have used variables which updates on each Layer (correct, incorrect) of the quiz builder. but somehow from one slide to the next one the Variable status does not update.

So maybe the variables are not updating from one slide to another of the same project, or maybe they are not updating on the Slide Layers and only on the Base Layer? Or probably i'm doing something wrong...

Can you please help me? I've uploaded the .story file

Thank you very much

Antonio