What it should probably show is each character and 10, then state that you get two of them and they can be the same one.
But, ultimately, it’s the same as it was before. You used to get 5 shards and it showed a possibility of 10, now you get 10 and it shows the possibility of 20.
It’s a limitation of using pictures instead of words.
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The possible rewards show 20 because you could potentially win 20 of one of them, though 10 of 2 different characters is much more likely.
The tab says “possible” rewards, after all.
But, ultimately, it’s the same as it was before. You used to get 5 shards and it showed a possibility of 10, now you get 10 and it shows the possibility of 20.
It’s a limitation of using pictures instead of words.