Whenever you find something that doesnt work, standard procedure is to disable all the extra plugins you’ve installed. Once you get back to a state in which its working, enable the extra plugins one by one, checking your site after each one to find the culprit.
The other option is to inspect your page for errors. I’ve done that and can see that Ultimate VC is throwing jquery errors. Disable it and see if that fixes your issue.
You are also running an older version of VC. Update it: https://archived.seventhqueen.com/forums/topic/steps-to-update-kleo-theme
Those two things will probably fix it.
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