Not Sure if a bug or not with Masteries

IDK if I'm the only one experiencing this, but when I'm in Champion Select, I am not able to choose some of my mastery pages. For example, If I wish to play with my Mastery page that I made for Kindred, it selects the mastery page that I have for Annie. Sometimes it doesn't even show it at all. If its something that's normal, please tell me so I know I'm not crazy.