Music overlapping/doesn't start/stop switching pages

Hi Bertrand!

I find your plugin just exquisite, yet It would be amazing if you could help me fix this:

music should start just on these two pages

https://www.luigiambrosio.it/portfolio/fotosciop/

and

https://www.luigiambrosio.it/portfolio/tutto-il-mondo-e-palese/

It seems that music just overlaps/doesn’t start/stop until I refresh the page itself.
Same problem on Chrome and Safari.

As I surely am not a WP/php/css pro, I just can assume that it’s a theme conflict, as it actually seems not to refresh pages from scratch.

Do you think there’s a way to let the plugin work properly?

Thanks in advance!

P.s.
Please note that the site is under construction, don’t be scared of the silly things you might find around! ??

https://www.ads-software.com/plugins/soundy-background-music/