yes it is. Mine have been opened and expanded from all the rain and snow this car has faced over the years. I have the same exact problem to. I've tried all kinda of cleaners to try and fix them or make them look good but to no avail. You're just going to have to live with them, unless they're badly scratched, I wouldn't worry about it, looks to be a common problem. If it isn't the weather stripping, I would assume its an exposed metal bar inside the door. Does it look like 1 or 2 vertical lines to the very left of your driver window (left when you're inside)?