distortion from iPhoto slideshow

Hi, when doing a slideshow from iPhoto'11, then in FCP7 (4:3 sequence) I have to distort the slideshow about -20 to see it normal. This does not happen when working with 16:9 sequences. Is this normal?

Thanks!

Johnny
iMac 21in., 10.7.4, i5, 8 RAM, FCStudio3.