Answer

Answer
Not a bug
That is how it works. If you do any progress in the quest, it will show the progress after the battle ends. In your case, there was also a notification of rank up bonus, so they both are visible at the same time.
Customer support service by UserEcho
That is how it works. If you do any progress in the quest, it will show the progress after the battle ends. In your case, there was also a notification of rank up bonus, so they both are visible at the same time.