Yes, that is indeed a known bug. Sometimes the settings database gets overwritten with an older state when closing vorpX. Will be fixed in the next update. Until then there is a workaround:
1. Before you close vorpX, open the config app.
2. Go to the “Local Profiles” page.
3. Create a copy of a random profile. Doesn’t have to be the one you changed before.
4. You can delete the (unwanted) copy again afterwards.
That should suffice to update the database on disk to the latest state and settings made before should stick when you close vorpX now.