Dark oak color bug

Hi guys.I found the bug with dark oak wood color.I built a room and I put on the ceiling a half block (quartz) to the ceiling put dark oak wood.It changed the color of the wood when there wasn't light.It Looked like a jungle wood.For more info on the image and sorry for bad language I do not speak English.

game modes: all

pictures:
first two pistures is night (2014-01-11_21.11.06/08)
and the second is day. (2014-01-11_21.11.20/23)