This might be better for https://meta.stackexchange.com/ but someone here might know.
For my question Musical Quines on an ASCII Piano I'm trying to award my bounty to this answer: https://codegolf.stackexchange.com/a/38224/26997.
I keep clicking the red +300 next to the answer and an alert pops up saying 'Are your sure...?', but when I click 'Yes' nothing happens. The bounty hasn't closed and has not been awarded.
Does anyone know what's going on? Am I missing some rule on bounty awarding?
The bounty closes in 4 hours. I'm using the latest Chrome if that helps.