you should have to disable the page slider in [8theme] layout option panel (http://prntscr.com/gtvmmi) if you want to use the VC slider but in your admin panel it does not show up and there is no option to enable it in screen options : http://prntscr.com/gtvnkn
Not sure why.
you have some third party plugins that are not listed here : http://xstore.helpscoutdocs.com/article/36-included-plugins disable them and check
update your all plugins.. specially redux framework and check..
hard clear your cache after every changes..