not filtering

Dear Plugin’s developers, I installed your plugin on woocommerce shop and it worked great! However after updating wordpress to 4.4.2 and your plugin to latest version, filters are visible but not work. What could be a problem?
My site with filter: http://www.reklamowe-kalendarze.pl/kategoria-produktu/kalendarze-ksiazkowe

Kind Regards,Piotr

https://ww.wp.xz.cn/plugins/woocommerce-ajax-filters/