Syncthing running on Linux Mint visible twice for other devices, device ID changes on reboot

Hi, I did my best to look through the FAQ, Docs and previous topics but I’m still confused about this.

1. On Linux Mint 20.3, installed Syncthing as instructed here
2. Created a systemd unit to run Syncthing as a daemon and on startup, by downloading this example unit from GitHub and running

sudo chown root syncthing@.service
sudo mv syncthing@.service /etc/systemd/system/
sudo systemctl daemon-reload
sudo systemctl enable syncthing@myusername
sudo systemctl start synchthing@myusername

So far so good, I can now open the Web GUI:

My other devices see the Syncthing instance too:

3. Paired it with other devices, synced some folders, was happy
4. Later rebooted the Linux Mint desktop, opened Web GUI again
5. The device ID has changed and all settings, shared folders are gone, it’s like a fresh install:
6. My other devices now see both ID’s as nearby devices available for pairing:

Hence:

• Is this normal? I saw in the FAQ the bit about seeing two syncthing processes in the task manager but to see two ID’s in remote devices as well?
• If it’s an anomaly, what do you think is the proximate cause here and how to fix it?

I tried doing the install quite a few times, always ran

sudo apt purge syncthing
rm -rf ~/.config/syncthing/
sudo rm /etc/systemd/system/syncthing@.service
sudo rm /etc/systemd/system/multi-user.target.wants/syncthing@.service (symlink to previous)

in between tries for a (hopefully) complete uninstall. I should also mention that after rebooting, the ID always changes back to the same ID, the one in the screenshots 5 and 6.

Thanks in advance.

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