Check your settings in RRConfig under Music/Page 1. You can set what you want to display like: %artist% - %title%.
Try making the settings on Music/page 1 in the config to:
Prefer ID3V2 tags
Show ID3 Playlists
Show ID3 Browse
and set both text boxes to:
%artist% - %title%
If they are set that way already, then you may want to investigate the actual tags in the MP3's further.