Incorrect sorting when "Sort By Artist"

When I sort my albums by artist [via Music>More>Sort By Artist ON] I found out that I am missing one album. The strange thing is that the total amount of albums stays the same, because one of the albums is shown twice. The album which is not shown when sorting albums by artist is from the artist "#1 Hit Songs Cover Band". I suppose the issue is caused by the fact that the name of the artist starts with a # or #1.

Does someone has the same issue? How to solve?