Can't use Generic 2-3 or 3-4 2017 rank up gem from variant 5

I explored chapter one of variant 5. Got generic 2017 rank up gems. I can't use them as I already have rank up gems of same class. There is no option to select what gem I want to use. What should I do?




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Second, why do you wanna use the generic over the class based gem?
@Kabam Miike @Kabam Vydious
Thank you.