You will now see a record of all the members you had matched with, even if they deactivate/delete their account. This is to avoid any confusion with your chats without you knowing why.
If you do not wish to see a deactivated member in your Chats list, please tap the ••• button on the top-right of the Chat and then select Unmatch.
Once Unmatched, they will move to the Unmatched tab.
If you have questions about how Muzz works, or need technical troubleshooting help, please check out our Help & Support page.