Problem with subscriptions

[Wire Fox Terror]

I have changed my preferences to receive instant notification when there are replies to threads I have posted in. It doesn't seem to be automatically subscribing me when I reply and I need to manually subscribe each time I reply to a thread. Also, my last 5 threads in My APC is showing threads from several years ago rather than my most recent thread replies. I'm not sure if it's something I'm doing wrong...Thanks in advance.