If I ask question in this Jira Atlassian Help Community, then it'll be subscribed automatically, and I should get an email whenever someone comment or reply on my question or thread. This thing was working fine previously, but I don't know nowadays I'm not getting emails and I forgot to follow up my own questions.
Two things happened:
1. I did something on notification settings, but don't know how to correct
2. I ask this question, but it is not automatically changes from "watch" to "watching"