Noticed, recently that Audirvana adds artists and album favorites on its own to Tidal.
Found those added favorites on my Tidal (Tidal app as well as Audirvana app).
Favorite instances are added (and sometimes deleted) automatically, soon as I start Audirvana.
Need to remove each one manually
Seem to have solved the problem. Uninstalled both PC (Tidal and Audirvana) apps.
Re-installed and changed my Tidal password.
Will monitor to see if issue returns.