I was wondering why the chapter repeated itself (besides the initial panels in the repetition showing them entering the room). But then I finally saw a change from the first half in the page 14 - where they suddenly show oneesan actually running a hair-dryer behind her back (back in page 5 mangaka had cropped it so it was really hard to spot).
That must be what mangaka meant by "did you see what happened?" - they had hidden the hairdryer we otherwise only heard about through dialogue.
Still, don't get the point of repeating the same chapter twice just to reveal such a tiny little detail. Could just have simply not half-hidden it the first time around, and the second copy would have been possible to skip entirely...