changing button image removes skscene

I started my projects as a Spritekit game. Put a button on top of my defaultviewcontroller in storyboard. Presented a scene in viewwilllayoutsubviews.

 if let scene = GameScene.unarchiveFromFile("GameScene") as? GameScene {
            // Configure the view.
            let skView = self.view as! SKView
            self.skView = skView
            skView.showsFPS = true
            skView.showsNodeCount = true

            /* Sprite Kit applies additional optimizations to improve rendering performance */
            skView.ignoresSiblingOrder = true

            /* Set the scale mode to scale to fit the window */
            scene.scaleMode = SKSceneScaleMode.AspectFill
            println("Width: \(scene.frame.width) andHEight: \(scene.frame.height)")
            scene.gameSceneDelegate = self
            sceneStack.append(scene)
            skView.presentScene(scene)
        }

After some time I transitioned to a new scene through viewcontroller code:

skView.presentScene(scene, transition: transition)

Now the scene changes but the button I had put on view storyboard stays there.. on top of the scene. Now On pressing the button I change the image of button... This surprisingly results in the scene changing back to the previous scene. As a result on changing the buttons any property it results in poping of my new scene and reverts back to the scene I presented initially.

via Chebli Mohamed