I would suggest going to minecraft.net and just switching your password. It would be the simplest solution. Are you sure caps lock is off?
The password for here can vary from your minecraft account. I use two different passwords. It's quite possible something occurred to his minecraft password which wouldn't occur on the site. It could have been hacked and changed, for example. This site doesn't go to minecraft.net to update the passwords to get on. The sites would remain constant and the minecraft would be the different one. Don't know how well I explained that, sounded to me like it just went on!
That looks like an amazing build! Where did you get all that sand, I need some. If your account was hacked into, just go to minecraft.net. They'll send an e-mail to the address the minecraft account is registered to that will let you make a new password.
