Modal popup not working on homepage

Hello,
I have installed SCLogin and put a modal link on my site header, the modal opens fine on all pages but not always on the homepage here accademiainfinita.it/ (blue button on the right hand side).
I know there is some conflict, because the modal opens at times, then stop opening again, but I do not see any error in chrome console, and as far as I know there is nothing fancy loading on the homepage, this is a gantry 5 template and the home scripts are the same loaded on all other pages.

I have tested by enabling the load jQuery setting as well as disabling it, but the issue remains.
I wonder if you could provde some help in debugging this.

Thank you!

Ok, this is auto-resolved now I think. The modal window has been working for some hours normally.