Your setting is correct and should definitely work. But there could be some other problem with your connection likely on your ISP side could be those ports blocked. So you need to troubleshoot it somehow. I would recommend you to install NGINX on Turris and configure it to listen on port 85. Then you have to open port 85 (not forward!) in Traffic Rules. Then use some other network connection to connect to your wan IP from this connection (Mobile LTE or other) try open in web browser http://your_wan_ip:85 and see if you get some response. Of course you should first make some hello page on nginx server and test it from your lan just to verify your NGINX server return any page on port 85 from your lan. This way you made sure that something is listening on port 85 and if it is not reachable from wan internet there is something wrong with your network connection at ISP.If you get some correct response from wan then you remove 85 from traffic rules and setup port forwarding to your camera and that should work.
As default turris firewall setup is deny all request and then it looks like port is closed from wan.
In order to enable some communication you have to have something running on certain port on turris device itself or forwarding port to another device within you lan. So that’s the difference.
Or better idea, if you have forris running on turris then you could setup port forwarding rule for port 85 or any other you want and forward it to your turris local ip address (usually 192.168.1.1 if you did not changed it) but make change in destination port to 80. This way if you open your wan IP address from mobile phone entering like http://your_wan_ip_address:85 should open forris login page and you had verified that port 85 is not blocked on the way.