Patagonia Product Care

HI there. I am the proud owner of a green Tres 3-in-1 Parka. I've had it for about three years and I absolutely love it. The only problem I have is that the front pocket 'flaps' curl over, if you know what I mean. It doesn't close close the pocket if, for example, my zipper isn't closed. It also looks a bit a messy. It's only on the right side. I've tried washing it and ironing it. This helps for about a day but then it curls again. Do you have any solution for this? Thanks in advance for your reply! Kind regards, Ruben