Sizing on blue sock is way off

Been wearing PI merino wool socks for many years and love them. I liked the blue ones, ordered my usual size large, but when they arrived they look like a sock made for a small child (couldn't get it over my heel). I also bought black and grey and they are just fine. Look at the photo comparing the large black and the large blue. I actually bought two blue pairs and they were both like this (makes me think there is a bad batch).

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