We’ve seen a similar issue on our side and I’m in contact with support regarding this issue.
In our case we noticed this issue after using the OS upgrade function in the web interface,
using the SD card image didn’t cause this issue for us.
As a quick workaround, check whether these files exist on the device:
ls /tmp/misc/recovery/backup*
If they are there, move them out of that folder so that they aren’t re-applied on boot: