Currently I have approx. 10 lovelace views and one of the is “attic” with approx. 5 cards.
Once I added a new view for my 3d-printer (just the view without any cards), I see all my cards from the “attic” view in my “3d-printer” view and I am unable to navigate trough the views.
Yes I went through exactly the same thing. I had to manually (or through GUI) purge all cards and recreate what I needed. It seemed to have something to do with Lovelace getting tripped up on an group/tab being stored with no cards. Specifically when I also created a 3d printing group/tab
I figured out that is has to do something with the URL of the lovelace view. Once you manually change to URL to e.g. 1/2/3 you can also solve this issue.