Those wireframe green squares are orthographic cameras (top, side, front etc). The ones that look like old movie cameras are perspective cameras.
When I opened your scene I got the following warning:....line 130: Could not find an appropriate startup camera: persp. A substitute will be used. //
This told me that there was a problem with the default perspective camera (persp). Somewhere along the line you have accidentally made the default perspective camera (persp) an orthographic camera. In outliner select the persp camera, in the attribute editor scroll down to the "Orthographical Views" and un-tick "Orthographic".
Earth: The crazy asylum of the universe.