Hi,
Chrome Dev tools was throwing up an error:
jquery-ui-i18n.min.js:6 Uncaught TypeError: Cannot read property 'regional' of undefined
at http://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/i18n/jquery-ui-i18n.min.js:6:117
at http://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/i18n/jquery-ui-i18n.min.js:6:73
at http://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/i18n/jquery-ui-i18n.min.js:6:84(anonymous function) @ jquery-ui-i18n.min.js:6(anonymous function) @ jquery-ui-i18n.min.js:6(anonymous function) @ jquery-ui-i18n.min.js:6
Which all relates to the datepicker script.
I commented out line 618 of the file: wp-content/plugins/search-filter-pro/public/class-search-filter.php
// wp_register_script( $this->plugin_slug . '-plugin-jquery-i18n', '//ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/i18n/jquery-ui-i18n'.$file_ext, array('jquery'), self::VERSION );
And the error cleared.
Just wanted to give you a heads-up.
it could be that another plugin is already importing that script, but I could find any trace of it with a search on the full site.