You site is displaying a lot of jQuery errors.
See following screenshot https://www.dropbox.com/s/d0a5d6ny5bdic23/lucas-real-estate.PNG?dl=0
This is not a theme related issue but an issue with jQuery not being loaded properly.
Here are 2 links which may help you,
I see you are using a CDN, maybe try disabling that for the moment and clearing your cache.