iTunes is changing the number/order of tracks in an album when it loads into my iPod. I want the tracks to stay in order

iTunes changes the number (and therefore) the order of tracks in an album when make a new playlist. Therefore, I cannot listen to an album in the correct order. I want the tracks to stay in order when I create a new playlist. It is worse than shuffle because the actual number of the tracks gets changed, so I cannot tell what order the tracks should be in.