@Seriously Ahh, sorry for my confusion! When you prop the door open to let air in, is there any metal on the door itself, or around where the door is popped open to? The internal reed switch inside the contact sensor will pull closed when there is a magnet there to show that it is closed, which is what happens when the door is closed. When your door is opened and repeating that it is being opened when it was just opened once, there could be a source that is pulling at the internal reed switch. Additionally, you may not have the door opened enough, and therefore the magnet nearby is trying to “pull” at the reed switch, and popping back and forth between open/closed. Does that sound right in your situation?
Thanks for doing that on the second sensor, keep me posted of course! 