Put the summary of the bug you're having here

What I expected to happen was...:
Just open or close the door when I'm or not on pressure plate.

What actually happened was...:
Some times "blinking" (The door open and close always during 2 secondes.)

Steps to Reproduce:
1. When i go to pressure plate the door is open.
2. When i go out of pressure plate : it's a blink signal. The door open and close always during 2 secondes.

• Same problem when i simply put the red stone torche on the dirt bloc.

• It's "blinking" some times without any reason (without going on the pressure plate).