Its a whole load of strangeness there but I'm wondering why he's actually got the OIS switched on when its on a tripod to be honest. Its a non servo zoom as well so the vibrations he's causing by turning the zoom ring will be complicating matters. He's calling it the 18-55 f2.8 lens but its not a constant aperture lens its f2.8-f4 so the flashing in exposure would be consistent with an aperture change causing an exposure correction as it progresses through the focal lengths if he had his ap