Hi,
Thanks for sharing your requirement here at Freelancer, I will be more than happy to help you.
I have reviewed your project details and understand that filtering is not working with checkboxes values and the same is working with dropdown option, so please allow me to check and fix the same.
I would like to mention that I will take payment only after completion of this job, I will first finish this job and then ask you to award project and pay at the same time to maintain trust.
Regards,
Kapil