Can’t add sites + other issues

Hi!

There are several functions of the plugin that suddenly stopped working:
– I can’t add social media sites from the list. Clicking them doesn’t work. Nothing is added.
– I can’t rearrange icons.
– Clicking the questions marks doesn’t work either .

I have no idea why this happened. I don’t know any code. I’ve tried deactivating several other plugins, reinstalling the Sassy plugin, restart the browser, login and out of WP… nothing works.

Please help!

Thanks!

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