Guys, I found out why you don't get notified of new posts on threads sometimes.
Say there was a post that wasn't directed to you, so you don't reply and go to your next subscription.
IT STOPS GIVING YOU ALERTS TILL AfTER YOU POST.
Well, for me anyway
It should alert you to a reply after you last post or read, but until you've seen the most recent post or posted you won't get an alert because you still have the original one. Make sense?