Hey guys. I haven't used maya for a really long time and I'm starting too get back into it by modeling simple objects. I was modeling a floppy disk and for some reason when I smooth it, a crease appears on one of the sections.

At first I thought I forgot to merge some vertexes but I checked and they were all connected. I don't know why it's doing this. There is something funny with one of the normals but I don't know if that's a problem or not.
Here are some pics: