Hi!
Thank you for the details, I think I see the problem there. Looking at the front page, there are a lot of javascript fatal errors reported: https://i.imgur.com/fA6819k.png
Most of them report a missing jQuery script, meaning, that the WordPress core jQuery script is either missing or there is something wrong with the minification process – as I see you have a minify/cache running there. These errors basically mean that multiple things are not functioning properly, due to the missing scripts.
First, I would suggest turning off the minification, to see if the errors disappear. If not, then investigating them further should be the next step, as any fatal script error may completely halt the script execution on the page.
There is an alternative option within the plugin back-end, to bypass any of these issues, that may work, however I rather recommend resolving these problems instead.