i have a really strange problem....

I have all my songs organized by genre, and on my ipod it repeats the genres, like it says rock and rock below it again, it does this wiht many of the genres, and sometimes they have the same artists in them, and sometimes it has one artist in one, and all the rest of that genre in the other...this is really wierd. I made sure that the genres on itunes were all the same, like spelling and capitalization, but it is still doing this.

also, i noticed this is only happening with those genres that appear twice in the genre window that pulls down when i organize my songs, i don't kno but i think if somehow i could delete the genres i don't need it would fix the problem so that way i would only have one genre of rock, pop, or whatever repeats on my ipod...pleassssssse help if you kno how to fix this, it's driving me INSANE!!!