Sorry for the desinformation earlier, I've tried today to unpug and plug back charging cable and my keyboard charged up to 100%. So now I can confirm that my issue is the same like topic starter written. My stuck points are 71% and 75%.
I have almost the same issue with charging ROG Claymore 2 battery. But for me it won't charge past 71%. Keyboard charge level always stucks at this points and it doesn't matter if I unplug and plug back charging cable, charge level in Armoury Crate a...