lol- my first thought when i saw that picture was- wow- they installed it backwards-I noticed a possible electrical problem with my ESC switch, looks like something is over heating and causing the plastic to deform, any ideas ?
but then i realized you were in australia......
that section that is bubbling up appears to be where the button/switch for the windshield de-icer goes......
have you checked the fuse box for any odd looking things there?
from checking kiatechinfo-
i cant find any fuses directly related to the windshield wiper deicers-
but there is a fuse 'deicer' described as 'icm relay box windshield defogger relay'
and another fuse 'ign 1-a'
described as 'esc switch,eps control module'
have you done any electrical mods where you piggy backed off the fuse panel onto either of those fuses?
in any case- i'd def take to dealer - cuz an electrical fire is no fun at all.
looking at the picture-that bubble up area looks just like what and where the plug would be if you had the windshield deicer......
wondering if there is a chance a piece of wire or something fell behind the cover and shorted a plug that wasnt being used out?