i pod classic 160gb.

Sorry if this is in the wrong forum, i cant find the i pod forum. I have a ipod classic 160gb, which ive had for some time, also i have an i phone 4. when i sync the i phone, no problems. But the ipod is not syncing some of my videos, mostly small music music videos. I have ticked all the music videos in i tunes, but it still will not snyc them, on the i phone they are all there. thanks for your help.. phil..