I answered a question that showed up on the main screen. I went back to the main screen. It said "0 Answers". I refreshed. It said "0 Answers". I clicked the question again, refreshed, went back to the main screen again, refreshed, and it said "0 answers". I waited 20 seconds, refreshed, and it said "1 answer".
I've never noticed this behavior before, and since I know some changes were made recently, I wanted to note it in case it's helpful to anyone on the SO team.