It's probably because you're leaving a link in the comment as http / / www. etc etc. I added that on the settings because a lot of people were complaining about robot spams leaving comments. >_<

It is up to the person who posted the entry to unscreen your comment, since the poster will be able to see your comment. I went to the entry you commented on and unscreened it.

I think if whenever you post a link, you write the html code, it doesn't check it as spam.