Goretex isn't a waterproof fabric. Any Goretex garment that is waterproof is made so by application of a durable water-resistant (DWR) coating, which eventually wears off (or goes a lot faster if you don't launder it properly). I'm guessing that with something like a glove, with a lot of seams and many many chafe points, a DWR coating doesn't last long under the best of conditions.