Sorry, it was late and I was thinking back to my issues with Docker Desktop for Windows. But actually, it doesn’t matter if you’re using Windows or Linux for the host OS. Docker Desktop runs in a VM regardless: Reference I think that’s where this random IP is coming from.
Docker DocumentationInstall Docker Desktop on LinuxInstall Docker on Linux with ease using our step-by-step installation guide covering system requirements, supported platforms, and where to go next.Docker desktop for Windows is a bad option for running a reverse proxy since Docker desktop actually runs inside a VM on your Windows host. Because of this it has no direct access to the network interface. So even if you run your reverse proxy container in host mode, the VM that is running Docker desktop still uses an IP handed out by Windows rather than the Windows host IP. 192.168.65.1 is the IP address Windows gives the WSL VM that runs Docker on your Windows box. I’ve had the same problem myself, and the only way that I found to fix this is to use Linux for the host OS. Reference