Iphone music is all messed up?

I got a song on itunes, then realized it was from the wrong album, so i deleted it by sliding it to the left in the music and hitting delete. I then went into the itunes app and got the right song from a different album. I tapped on it to play it and it took me to another one of my songs, the same song everytime i tapped it. Now if i tap a different song, it takes me to another song. The one i had deleted now shows up below the new one i bought. I can't slide to delete it, but i can delete other songs. Sorry if that was confusing, but i need help!

Update: i hit shuffle and then tapped on the new song and some others and they didn't go to other songs, but the old one is still there and undeletable.

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