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The bladder can get twisted inside the strut when deflated and sticks to the sides of the strut when inflating causing a section of the bladder to stretch. This is exasperated if the strut was not put in properly aligned with valve and end-connection points.
I had a visible crease at front of strut. I flushed the strut inside with fresh water in case some gunk (algae?) was sticking inside, didn't help. Vigorous shaking before and several times during inflation helped somewhat, so try that. Brand offered advice but were baffled by its persistence and replaced the wing, fantastic support and service.
A friend has a similar problem with another brand's wing and thinks it's something to do with the double layer of bladder material at the end so has cut that away. Sounds drastic and swapping one problem for another
