By the way, on the main website I see that the theme is including its own jQuery at themes/tcf_2016/assets/js/jquery_1_11_1_withSizzle.js
This will most probably be the problem.
It is often advised to use the jQuery that is included in WordPress. Now there are two. The first one that is loaded also loads a few jQuery plugins, then the second one loads and the first one with plugins gets wiped from memory.