Can you first change the combobox script that S&F is using, and remove that CSS and let me know when done?
Change the combobox script to Select2 (there is an option in our settings page to choose which Combobox script to use). Your current form uses Chosen, which is set within our plugin by default. However, it is now pretty much abandoned and has not received any major updates in a long time. It has poor support for iOS devices for example.
Select2 is maintained now by the WooCommerce team, who are, of course, owned by Automattic, the owners of WordPress, and as such is used by a lot of themes and plugins.
Do you need these controls to be comboboxes:
https://www.screencast.com/t/s83eHGRPM
Or was that for styling reasons? If it was for styling reasons, do they need the search box at the top?