Same artist appears serveral times

Server Version#: 1.21.3.4021
Player Version#: 1.27.2.1599

Hello,
I tagged several CD-sampler with albumartist “Indie-Sampler”.
Unfortunately, the artist “Indie-Sampler” appears several times in PLEX. Some folder include only one CD album, other folders include several sampler-CDs.
As the general tag is for all CDs the same (albumartist=“Indie-Sampler”, I do not have a clue why Plex is not putting all sampler-CDs under the artist “Indie-Sampler”.
Would be great to get an advice what could be the reason for this behaviour.
Best regards,
Maik

Plex doesn’t just look at tags, but applies some sort of fuzzy logic based on folder names, filenames and matched metadata from online sources (last.fm, musicbrainz, etc). It could be any of these things.

But you can manually merge these duplicate artists in the web UI: select the albums, go to the menu top right, “merge”.