I might be wrong but it could be due to the new payout system with the new upvote time window. In the past the time window was of 30 minutes, if you upvote a post from 30 mins onwards, you get 100% curation rewards, if you upvote at 15% you get 50% and the author gets the other 50% etc... linearly until 0% where author gets 100% of curation rewards.
Now the time window is of 15 mins but what would go back to the author when the curators upvote before the 15 mins goes back to the reward pool instead. So technically, the payout is author reward + curation reward - what went back to the pool.
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Thanks for the response @quochuy! Will be interesting to see what others have to say and to get to the bottom of this.
What do you think about the burned amount?