The weather stripping on the outside of my garage door is wavy, as is the metal trim its anchored through, which leads to a lot of air leakage. I could just caulk this as is, but I'm guessing the results would be better if I removed some of the waviness first. However, I'm not really sure what caused it, how to undo it, or how to prevent it from happening again. Any tips about that? It's been like this for years, but is now becoming an issue as I'm working on insulating the garage.