Title tag comes out weird on my homepage

The title element on the homepage of my blog has the title “Site Name – “. I’ve fixed the problem in my child theme by overriding the line with:

< title >< ? php is_home() ? bloginfo(‘name’) : wp_title(”); ? > < /title >

However I wondered if this is a bug that needs looking at? Or perhaps it’s a misconfiguration of my blog? I’d prefer not to override this file in my child theme if possible!