Let me see if I can get most of these points, in no particular order:
The 2-digit codes are likely the last 2 hex digits of the device's Thread MAC address, and of little use if they don't match the known MAC addresses of devices you have. A device's WiFi, BT, and Thread radios each have different MAC addresses. You can try to track them down by unplugging a device and seeing which one vanishes.
Thread Network/Router Identification:
- Apple Thread Router = Currently either an Apple TV 4K or HomePod mini.
- Thread Router = a non-Apple device that has the role of Thread Router.
- Do you have 7 HomePod Minis or mini+ATV4k? Then I can't explain why they don't all say "Apple".
- If you tap each a device in the list, you'll get more info about it, but it probably won't help you figure out much.
- Also, your Eve Weather is missing. It's not currently in the Thread network; i would reset it and re-add close to one of the Apple devices.
Unknown Room:
This does not look correct. All my Home configuration automatically populated into the Eve app. This probably means a disconnect between your Home.app setup and the Thread network, or other configuration problem. What do you see in the Eve app Rooms tab (see attached)? In the Home app, do you have rooms set up? (when you tap the 3-dots at top right do you see the list of Rooms?) Do all your HomePod minis and ATVs appear in the correct rooms? Check all the Apple devices are up-to-date? I just remembered, long ago I added some speakers (non-HomePod) that ended up in "Default Room" in the Home app. So start by making sure devices are assigned to the correct rooms in Home.
Thread, in General:
Thread is surprisingly long range considering the low power of endpoints like battery operated Eve Weather. You shouldn't have to spend time managing it; the Eve Thread Network Maps is useful as curiosity. Thread is self-structuring and self-healing. I find it very reliable and refuse to use any BT devices in my Home-setup. This is a great primer on Thread:
https://openthread.io/guides/thread-primer
Let me know if that helps.