I can't buy all unlocked mastery rewards, I can buy only one reward for some characters and anything for the others.
For example my Meave is level 10, I can buy her mastery emote but I can't buy her mastery pose. Same for Skye level 28, I can buy the skin Cosmic Skye but I can't buy the skin Obsidian Skye, the mastery emote and pose. My Torvald and Cassie are level 12, but I can't buy their mastery emotes and poses.
How can I solve?