Multiple Artist ID's connected to one artist

[neorevelation]

I just recently found out that there can be multiple artist links associated with an artist on Spotify. Here's an example (all of these are JAY-Z's ID's) can input them in https://open.spotify.com/artist/{id} :

• 6jEQFo3iBSyW1f9DVBLknb 

• 2tFblYtXKLTFjvH1sxfbv1 

• 2KUhiqlXzyDGS97SSaUsqn 

• 3nFkdlSjzX9mRTtwJOzDYB 

Does anyone know why that is / how these ID's came about? If you do, how often does this happen? Do the main ID's of an artist constantly change?

To add to the confusion on Spotify API if you input each of these ID's through the https://developer.spotify.com/console/get-artist/ endpoint, you will notice they all output different follower amounts but everything else is the same. You will also see that the output is the same ID (3nFkdlSjzX9mRTtwJOzDYB) is this the master ID (will this ever change)?