Hi,

Please make sure:

1/ You're using latest version of the theme ( 7.4.0 ) - if not, please remove the code at the end of functions.php file like on this image: http://prntscr.com/uon4qx ( if you don't see it, you can ignore this step )
After that, do following this guide to get auto-updates the theme: https://pencidesign.ticksy.com/article/15633/

2/ After updated the theme & plugins - if it still doesn't work, please try to deactivate all plugins ( except plugins come from the theme ) and try it again. If it works, let's enable each plugin to check what's plugin caused this issue. 

Best Regards,

PenciDesign