Recently, I activated a bounty of 100 on one of my questions. The bounty grace period has now ended. Here is a link to my question: Stack_overflow_bounty_question.
The notification of bounty appears as given below:
My question still not has received any kind of answer from anyone. Then why does this message or notification appear?
Award this bounty to the best answer as soon as possible.
This question is entirely different from the suggested answers. This notification is clearly a bug that is to be fixed according to this answer bounty-grace-period.