When I load in the game,I find all the observers in one chunk are always powered.I try to update it(put the block on its face) but it still powered.It's a pumpkin farm and all observers are in one chunk.The farm is not working because I put the block on the pumpkin stem.I just load the game and I don't know how this happened.
mc world(it's big XD):
mega netdisc:
https://mega.nz/#!4NMGHZyb!-1rVSsfNskJsFMDpZKfrmKph6AK-IvPHqoOVLsDMRx8
baidu netdisc(chinese):
http://pan.baidu.com/s/1bBLGIE