Problems with iPod-title display on iPhone4

Hello all,

I have a problem with the iPod app on my iPhone 4.

I ripped several of my CD's with "Exact Audio Copy". Then I used iTunes to load them to my iPhone.

Some of the albums are ok, but other albums shows the name of the interpret followed by the title in the titlelist.

example:

The titlelist of Enya/And winter came... shows
1 And Winter Came...
2 Journey of the Angels
3 White is in the Winter Night
...
This is ok


The titlelist of Amy MacDonald/This Is The Life shows
1 Amy MacDonald...
2 Amy MacDonald...
3 Amy MacDonald...
...
The title is behind the name of the interpret, but I can't read it because the line is too long.

The files have the same tags (both are ripped with EAC) of course with different content.

To make it clear:
there is a tag "Interpret: Amy MacDonald" and "Title: Mr Rock & Roll"
but there is no Tag "Amy MacDonald - Mr Rock & Roll"

Why shows the iPhone sometimes interpret and title and sometimes just the title? Does anybody know this problem and is there a solution?

Thanks for the help and regards....