price filter slider

Hello,
the price slider is missing from search options filters in my car listing page.
Never worked. I found that there is a price filter slider from your plugin demo site.
I have the price category, I’ve inserted the listing_categories.json
It is active in the Listing Categories but is nowhere on my car listing page and the other filters working great.
When I unchecking the “display field as slider” option in the Listing Categories section, it appears last within the filters area but as an empty drop down box so I cant filter by price.

Thank you