Why is this happening? T_T

That happens sometimes, just play for a few more minutes.

That happens to me a lot too. If you keep playing for a bit longer, you'll get a notification saying you've completed a treasure quest.

The ones above and the time quests are sometimes different, so I play the game a bit more.

That happens sometimes, but if you check again after some time, the reward should pop up. It happens often, so you'll get used to it lol;;

Sometimes if you wait, it'll fill up over time.

Me too ㅠ So I have to do more than the time quest time.