itunes match not matching all songs!

Hello,

I have updated my itunes match and I found that many songs do not get matched and instead get uploaded even though the songs are on the itunes store! Some albums are even cut in half, between matched songs and uploaded songs! How does half an album get matched and the other have need to get uploaded to the cloud? Is there a way to force itunes to match the songs that it couldn't match before, seeing how they are on the itunes store?

-Thank you!