titles dont' match songs.

I did a search and did find anything, I thought I had read about this though. I am going through a few of my albums and deleting songs I hate that I used to skip over. Then I noticed the titles didn’t match the song that was playing. I went out of that artist and went back in and the titles were still wrong.

Does it have to refresh?  Now I am wondering which songs I am deleting, the one I am hearing or the one I am seeing!