I read the guide on how to do double doors, and I have successfully done a bunch. But for some reason, I try to build another one, and like most people, the left door gets stuck while the right works perfectly. But I found that if I place the doors down one block(right next to the redstone, and and one block above), the doors work perfectly.
And its weird how seeing as I have 2 fully functioning double doors in front and behind the one I'm trying to build.
Edit: Oh wait, I found out that it was cause I had too many redstone torches in the vicinity of the doors. Like, right beside it.