after using only one vault for many year, I wanted to create a new vault and named it with a specific name. After shutting down my computer and opening up next day, the Name of the Vault changed to “Vault” and did not have the name that I added the day before.
Unfortunately I dont have an idea what is causing this on your machine.
I tried to reproduce it, but for me it works without any issues. No matter if I rename “old” vaults, or new created ones. After a restart the name keeps changed.