Actually it’s weird for me about this issue, because i don’t get this kind of problem on my side on my local server that using same version of Jkreativ Themes.
It seems you will need to reinstall the theme and required plugin. Maybe there are some conflict between our theme and not related plugin in there. Please still only using required plugins that come with JKreativ for a while. After that please try to replace this file jkreativ-themes/public/js/internalmin/jquery.jportfolio.js again.