No, I'm not looking at recent tab.

I already made this question months ago, but since I still don't have any solution I thought to try my luck again to see if anybody might know. This is what happens:

I cannot see every sticker I added to favourites, only a very limited list of them. If I tap on a sticker I already added (sent by other person, the same sticker) it tells me to delete it so it is in my phone somehow but I just can't use it. If I delet it and add it again, it appears, but I never know which stickers are going to disappear next. I think if I use a sticker a lot of times it usally don't disappear while I'll do it.

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I don't know what to do, been like this since the beginning. My phone is a Xiaomi Redmi note 6, if that helps.