Library version vs Tidal version

i have added both versions of “the very best of dire straits sultans of swing” to my library. i only use tidal/roon with no local library. when i choose one album and click on versions it shows me the other album as being a tidal version even though i have added that album to my library too. there are only 2 versions of this album. surely if i’ve added both available versions to my library there should be no tidal version left and only 2 library versions? can someone explain this it’s puzzling me. it has also occurred at times with other artists. thanks mk.