Hello,
We have checked your site with the default theme – Storefront and see the same problems with the price filter https://gyazo.com/3f3e1886c4bf77c61927e77a41d777d4
I suppose WPML plugin could be the reason of the problem, so contact WPML plugin support. We can help you only with issues related strictly to our theme if default filer does not work even with the default theme we can do nothing.
Regards