No dialogs or Lightboxes working

I’m having some problems with my site, where EVERYTHING that works with dialog boxes/lightboxes/popup boxes aren’t working. And I mean nothing.

Right now when I want to upload images, I have to go to media and drag and drop – which isn’t that tough, but when I want to schedule posts for future, then I’m screwed. Because of this, I haven’t published any new blog posts (and I want to start to publish blog posts).

I’ve tried turning all my plugins to see if that’s it, but that doesn’t help it. So now I’m totally confused.

Can anyone tell me what might be causing this?

My site is: https://www.mauriceburke.com