When you comment in a thread, unusually, you have the ability to reply to one particular post. Many forums only allow you to post a reply at the end of the thread.
The way it's done here on TFL makes good sense, but I think that the default notification option should be changed.
There are two radio buttons "All comments" and "Replies to my comment".
The default for the radio buttons is "Replies to my comment". In my opinion, the default should be "All comments". After all, if you have bothered to post a comment, then you are likely to be interested in all new posts in the thread.
It is quite easy to forget to change the radio buttons and then you may miss new comments in the thread.
Lance
is All comments. Not sure why yours is different.
Go into "my account", then "edit".
Many thanks!
Lance