SvA - 2014-09-19

Where to, exactly did you paste the songs? Into the Song Editor Chord/Lyrics edit box?
Do the new or the old songs have Override Style enabled on the Advanced page in the Song Editor? If so, make sure they have similar settings. If the new songs do not have this option turned on, make sure the settings in Presentation Settings from the Settings menu are correct.
If, with this information, you are unable to fix the issue, you may send me one of the misbehaving song files for analysis (use SourceForge's SendMessage function).