You're right if the photo was taken as they appeared and with the triggering scatters still surrounded in flames, just before the 'play free spins' screen appears.
When the bonus is complete and you leave the trigger screen in place, the scatters are ordered logically from top left position, down reel 1, then to top reel 2, down and so-on - at least that's what appears to have happened here.
BUT I have just taken a still from the same time on my recent video when I got a 6-scatter trigger, below, and it does NOT order them after the event.
So either the image is bullshit, or the version of the slot he played may do this after reloading - on some sites the Quickfire game does indeed keep the same screen when you disconnect and reload, instead of defaulting to the G-O-L game opening screen.
I did wonder myself as that screen has remarkably little ways in play for an 8-scatter trigger, looks very odd. Must've been the perfect alignment from action 1.
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@Big Time Gaming ?????