Editing my Title and artist

When I save my artist and title fields I get this happening all the time

Conway Twitty\\Conway Twitty

How do you save them?
Does "Conway Twitty\\Conway Twitty" appear even if you enter "Holy Moly and the rat pack"?
What kind of Tags do you have in the files?
WHat kind of files are these?

This happen with all my music files which are saved as mp3

Menu Bar > Tools > Options > Tag Panel > Default values:
Set every value to "< keep >"

Generally, if you have "\\" in a tag, it seperates the tag into two tags, a so called multivalue tag. Very usefull for Genre, but can also used for Artist if you have a collaboration between two artists.