Game window not updating parallel

When i move a camera or any game object in front of camera the parallel GAME view doesn’t update properly instead it shows several instances of object as a trail of an object when using layout (2 by 3). I need to change ratio aspect each time to get updated view. This is only happening in specific Unity3D project (the new game which in working on) not on any other project, and it wasn’t happening before when i started the project. Please help me out
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Looks like you’ve changed the Clear Flags of the camera to Don’t Clear. For your scene, looks like Depth Only will do, otherwise Skybox or Solid Color.