I found this "bug" today, wanted to rank up some champs since I have 2 generic rank up gems in overflow expiring soon, so I took my BWDO to r3 with one of the gems and was planning to use the other one to rank up immortal abom, so when I reached r2 max level, it shows the option to use a rank up gem but since I also have science rank up gems, it only shows me the science gem. Basically the game won't let me choose between using the generic, which I want to since I have one expiring soon, or the science gem.