Price Filter not working

I have your YITH Product filter installed on my site but it does not work for the price (all the other filters work) i have installed the widget correctly,

Here’s the link to a search for opal ring, once you select a price range, it forgets what you search for.

https://letsbuygold.com/?s=opal+ring&post_type=product&type_aws=true&id=1&filter=1

Thanks

Louis

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