Need help with lightning through objects?

Hello, I’m having major issues here. I recently started playing around with this engine and I love it, but… I’m creating a house and somehow its basically light inside on some places (even after I’ve covered the entire house with blocks) just too see if that works. So something is lightening these places up and I have no idea what it is, there’s no light sources except for the sun which is completely blocked out. Here’s some pictures

Hopefully you get what I mean

http://i.imgur.com/iU46TXQ.png - Image showing that I tried blocking the entire house (so it should be COMPLETELY dark in there)

http://i.imgur.com/RsQTVAz.png - A hallway that got some weird light in it

http://i.imgur.com/eU6FOqu.png - And then this as well.

Theres more of these places as well.