Yesterday i finished my daily quest and got my 10 gems, because it was my 6 for the week i got an Ancient shard. 

I used the shard and got a new Rare Champ and stopped playing for a few hours ////////////////////////// so far everything is fine. 

On my next login(a few hours later in the same day) my daily quest was rolled back and i had a few tasks to do again. And i had an Ancient shard in the Portal. But i still had the Rare Champ i pulled earlier too.

When i finished the tasks again it added my overall monthly count for the Void Shard.

Overall i ended with bonus: 10 crystals, an Ancient Shard and 1 less daily quest for the Void shard. 

Don't get me wrong, I'm not complaining but a Bug is a Bug and needs to be reported!

Edit: My phone is Huawei P10, EMUI 8.0.0