Hello. Thank you for contacting the Toolset support.
As I understand - you build a parametric search but for instance for the checkboxes field "Residential Communities" you want to apply "AND" clause rather "OR" when multiple checkboxes selected by user - correct?
And you want to apply this for all the checkboxes fitlers - correct? If yes:
*** Please make a FULL BACKUP of your database and website.***
I would also eventually need to request temporary access (WP-Admin and FTP) to your site. Preferably to a test site where the problem has been replicated if possible in order to be of better help and check if some configurations might need to be changed.
I have set the next reply to private which means only you and I have access to it.