Incorrect position when fence gate is opened

Two gates connected to stone walls. When you open a gate, one gate will be higher than the other.

Steps to duplicate
-Place down 2 gates left to right.
-Place a cobblestone or mossy cobblestone wall to sides of gates.
-Open a gate from the opposite side from where your standing facing the gates. (It's back position)
The gates position will change. One gate higher than the other.