Hello @Syntax,
welcome to the community of Nextcloud
You started a topic in support category. Unfortunately you ignored the template and a lot of information to help you is missing. Please edit your original post and add all required details like Nextcloud version, webserver type and version, os version, related log file content. Use the support template.
Without additional information the community members cannot help you.
I’m running standard community docker and can’t confirm your finding. the app goes to the right domain. I would recommend reviewing your reverse proxy config 101: reverse proxy and if you still experience issues adding logs and configs as required per support template.