I was riding down the road today and I heard this sound coming from my driver's side door. I thought the window wasn't rolled all the way up but it was. After searching for the issue I happened to look in my mirror and saw that the top of my B Pillar cover had come loose from the door. I stopped to see if there was a clip or something missing but didn't see any clip or anything there. It's not cracked or broken. How do I fix this?