On mobile when you click on an image to expand it the screen blinks 3 times and the image expands with a lack of transition. The weird thing comes again if you click again: you're redirected to the top of the page.
On iOS 6 with my iPhone 5, I have to click images twice to get them to expand - a single click just shows the 'click to expand' prompt - and then it expands as expected on the next click - but I don't get the screen blinking thingy you describe..?
I've actually confirmed this now a few times. Double clicking on the image to expand it causes it to blink a few times. Basically it is not smooth or a nice transition.
I think we're going to write this one down to a case of tiny screens with tiny graphics processors can't really be expected to smoothly animate huge graphics and leave it at that.