Most of my avatars are unfavoritable, but one isn't

I’ve been having problems with one avatar I had favorited before, but when I wanted to switch a avatar I found, the avatar I favorited before couldn’t be unfavorited. It didn’t work somehow and I’m unsure why. Is there something that I gotta do?

It disappeared somehow but 25 never changed to 24. Then suddenly came back afterwards. Is it a glitch?

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