After last updates, website is not working well anymore

I’ve been using the Specular theme for my website for several years now, but since the last updates, parts of the website are not working anymore and I can’t figure out why. For instance: our Flexslider is not working anymore and the whole drop down menu is gone. On the back side it says it’s all fine and those pages are connected to their mother page, so I can’t figure out why those pages are not visible in the drop down menu. Is this a known problem? Is it a bug that will be fixed soon? Or is it something else?

Hello. This is a forum. It is unlikely that the author of this theme will see your thread here. You’d better write a message to the author of this theme.

Thank you!