In the beginning I thought it was a minor problem, but after one of my cronies experience the same problem like drusoft, the guy who initially email me because of it, I tried to identify the source of the problem, and discovered that it was because of the Bad Behavior Plugin. It was actually TOO EFFECTIVE that it bans IP (Internet Protocol) addresses that are blacklisted as potential spammers (not that we know that we were listed or not). More details of the list can be found HERE. Owh yeah and this is about problems related to wordpress

So in the future (for wordpress users), just use Akismet and Trackback Validator plugin for spam prevention. Many thanks Zeo for the guide! (also had the plugin installed in my wordpress, so had to remove it to prevent such thing from happening to me)