iPod Double

I have a weird lil problem on my iPod. I have 2 albums of one band, and when i was putting it in i accidently had a space infront of the name. So i selected all the songs, and deleted the space so they were all the same band name. My ipod has the band twice one with the space and one without. They both have ALL the albums+songs in them. My itunes is corrected, and ive sinced my ipod many times.

How can i fix this without formatting?

Thanks,