Spoiler not working

Hi,
I have been using your plugin for some time now, and it had worked fine, but I have just noticed that the spoilers in one of my pages are not working any more. This is the link: https://www.paisaia.com/proyectos-de-paisaia/

When you click on each of the five pieces of text, some content should open, and it did for the last couple of months, but it doesn’t anymore. If I edit the page from the WP dashboard the content is there, and the shorcodes seem to be ok.

I can’t figure out what has gone wrong, any idea?

Thanks a lot!

https://www.ads-software.com/plugins/shortcodes-ultimate/