Brake rub causing car to wobble

I recently cleaned out the brakes on my 2002 e825. After reassembling everything and testing the car on the road, I noticed that it wobbles. This was not an issue before. I jacked up the front and spun the tires and could hear the right-front drum rubbing. I took the wheel off and spun the drum myself. It looks like the drum catches at certain points of rotation. It also looks like the drum cover is not on completely at the top. I screwed in the cover as tight as I could, hit it with a hammer, and yet it still looks off. There doesn’t seem to be anything in the way of the cover but the gap at the top is noticeably bigger than the rest.