One fell strike doesn't progress. You will see it show up during your strike as completed then when you go to claim it, it is at 0 or 1/50. Keeps reseting.
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Yep I've had that. I just got 186 kills in the Navôta Strike and its showing 0 out of 50 kills. I guess it was too much to hope for that a new event would start without any problems. Bit like hoping the Sun won't rise. Or you don't need the toilet anymore.