I made a fresh backup using these rules:

clicking on "Extrahieren" results in a wrong display
with an "empty" top level directory name...

... wherein again subfolders (etc, work) live:

Thanks for reporting. I can reproduce the issue. Will look into it when time permits. Until then you can also use the Mount-feature to restore backups.
The extract feature works fine, as long as you ignore the item at the root that doesn't have a name.
This should be fixed by #883. Please let us know if the issue still occurs in the current master branch on Github.
Here more on testing the current pre-release version: https://github.com/borgbase/vorta/discussions/895
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Thanks for reporting. I can reproduce the issue. Will look into it when time permits. Until then you can also use the Mount-feature to restore backups.