Price Min Max Search and Filter not working

I have a client that has been using WPProperty for many years. We just found out that the price search is not working. If you go here: https://www.yourwhiteknight.com/properties and search for a Max Price of $35,000 it reduces the number of results but it shows prices that are obviously above $35,000.
https://www.yourwhiteknight.com/properties/?wpp_search%5Bpagination%5D=on&wpp_search%5Bper_page%5D=10&wpp_search%5Bstrict_search%5D=false&wpp_search%5Bproperty_type%5D=modular&wpp_search%5Bprice%5D%5Bmin%5D=0&wpp_search%5Bprice%5D%5Bmax%5D=35000&wpp_search%5Byear%5D=-1&wpp_search%5Bbedrooms%5D=-1&wpp_search%5Bbathrooms%5D=-1&wpp_search%5Bsquare_footage%5D=-1&wpp_search%5Bpark%5D=&wpp_search%5Bpark_type%5D=-1&wpp_search%5Bwidth%5D=-1&wpp_search%5Bcity_name%5D=-1

If I put in a min price of 5000 and a max price of 35000 it shows no results even though we know that there are properties in that price range.

I did a search request for 5000 – 55000 and it seemed to work but when I checked the properties that are less than 20000 do not show on the list and I am not sure if others are missing as well.

Interestingly if I put a min price of 30000 and a max price of 75000 or 10000 to 50000 it seems to work but once again after the above results I am unsure if it is capturing all the data correctly (https://www.yourwhiteknight.com/properties/?wpp_search%5Bpagination%5D=on&wpp_search%5Bper_page%5D=10&wpp_search%5Bstrict_search%5D=false&wpp_search%5Bproperty_type%5D=modular&wpp_search%5Bprice%5D%5Bmin%5D=30000&wpp_search%5Bprice%5D%5Bmax%5D=75000&wpp_search%5Byear%5D=-1&wpp_search%5Bbedrooms%5D=-1&wpp_search%5Bbathrooms%5D=-1&wpp_search%5Bsquare_footage%5D=-1&wpp_search%5Bpark%5D=&wpp_search%5Bpark_type%5D=-1&wpp_search%5Bwidth%5D=-1&wpp_search%5Bcity_name%5D=-1#/requested_page=1&sort_order=DESC&sort_by=price&i=1&unique_hash=16885). Why does it not

Also, if I search by price and click “Sort by: Price” at the top of the list it does not reorder the properties by price when I have used the price Max filter.