Cannot deselect an object in the scene

When i add a 3d model to my scene, i cannot deselect it. When i move my mouse to zoom in or out in the scene, the 3d model is scaled though i’m not selecting anything in the hierarchy nor the scene. when i use the hand tool, the model is translated. How do i fix this?

maybe screenshot or gif would help (to see whats happening)

or make sure that you are zooming in Scene window, not Game window?