The easiest way to quickly confirm this is to open the Extended Tags window.
Press Alt+T as a shortcut.
If you see more than one Artist (or any other field), then the \\ characters are just placeholders, indicating this as you currently see them. Follow the suggestion in the link above provided by @ohrenkino to make the changes you want.
This is an "escape" function. To show them here as-is on the forum, use the Preformatted Text key in the menu above, or enclose them in back ticks. \\
Wow! thank you, thank you, thank you, VERY MUCH!
Answered faster then correcting my faults with \ \ \ in the text
I am using this top-program since years and never used ALT+T
Also didn't realize, that there are more than one artist-fields!
You never stop learning!