Hello. Thank you for contacting the Toolset support.
It seems you need to add the taxonomy filter to your view to filter the posts belongs to your selected taxonomy term which you are passing it as URL param.
If you can share the problem URL and access details, once I can review your current setup I will be able to guide you in the right direction.
*** 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.
Yes - if you see that the requirement of yours is matching with what solution shared by Nigel, you should go ahead and check with that first. Hopefully - you will not have any issues with that.