Ok. Thank you for the reply. My next question now. I have separated out the fields into normal DatePicker ACF fields as seen here: http://acs.ccgproof.com/sheriff-sales/
The Sale Date(s) fields are listed as sale_date_A and sale_date_B within ACF. I have set these both up as Post Meta fields within Search & Filter Pro. They are both set up identically in the settings, however I am only able to get results from the first Date Picker through your plugin. However, if I type in the date within the normal search field at the top of the form I get the expected results.
If I switch the fields to a Dropdown List then the issue goes away and I am able to display results using both fields. But the client would prefer to have both field be datepickers.

Any suggestions on that one?

ok. I went back through and if both of the search fields are set to the Post Meta and Date type then the sale_dates_B field returns no results. And just as an FYI. If I switch the order of the two date fields, then sale_dates_B works fine, but now sale_dates_A field does not return any results.

ok. thank you for your investigation.