[Plugin: WP Custom Fields Search] Drop down menu ordering

Hi there, absolutely love the custom search plugin.

I have it all running great on my site with a vast database, my only issue now is sorting the order of the drop down menus on the search pages.

Have a look here:
https://www.totalforextrading.com/forex-trading-search

If you select “Forex Trading course” and then the “Cost” menu, you’ll see that the results are in a random order, and I would like to be able to get the drop down menus in numerical order from smallest to largest.

Any one know how?

https://www.ads-software.com/extend/plugins/wp-custom-fields-search/