Can't add certain characters to favorites list?

dwilson2000
So Ive been tying to add Illya and Sia Lisianthus Eustoma to my favorites list but no matter what they wont show up on it. And the heart is filled out so I know I clicked on it. I thought it was because I just had too many characters so I took some off but theyre still not showing up. Anyone know how to fix this?
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