I bet some of y'all have the same problem. In the middle of the 21 era Adele stylized her name in capital letters, when I bought 25 she stylized her name to low caps again and now my iTunes show her in capital letters (artist name) I was trying updating the metadata but it doesn't work. The problem is on my iPhone, that's where her name is showed on capital letters. Any solution?
You can change the information of an album, song or artist in iTunes by going to "Sorting". In your case, if you want the albums under the same artist (Adele), select all songs by Adele > "Show Info" > "Sorting". Then you need to fill in "Adele" four times in "Artist"+"Sort As" and "Album Artist"+"Sort As". Then it should be OK.
I'm using the Dutch version of iTunes btw, so translations may be off in your version.