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That's normal. Plexguide uses traefik for SSL reverse proxy. Traefik uses host headers (the url entered) to determine which container to direct traffic to. If you want to address by IP, you can redeploy traefik via plexguide, and when it asks for url, enter custom url of the IP address. It will then be addressable by IP or by portainer.yourdomain.com. If you haven't closed ports (don't recommend leaving them open) you can also address by http://ipaddress:9000. Note this is unsecure http, not https. The former method will be secure https.