Steam recently changed the default privacy settings for all users. This may impact tracking. Ensure your profile has the correct settings by following the guide on our forums.
If your profile is showing up as Not Ranked, please review our rules page and follow the appeal process detailed there.
It's normal, when you visit a page on the main site a cached version of the page is created. So when you make a comment and refresh, you're still getting the same page. After about 5-10 minutes the cached is expired and next time you visit the page your comment will show up.
We're looking into manually refreshing the cache whenever a comment is posted. That would fix the problem.