It looks like you have enabled the option to show white space and tab characters.
Click on the View menu and select "Show Symbol" and un-check "Show White Space and TAB".
Wenn ich in Notepad ++ Leerzeichen eingebe, wird ein Unterstrich angezeigt. Kannst du mir bei dieser Ausgabe helfen?
It looks like you have enabled the option to show white space and tab characters.
Click on the View menu and select "Show Symbol" and un-check "Show White Space and TAB".
I don't why you having this problem, will you just try to reinstall the notepad++. May be that will help.