hmm...I wonder if it would have done that if you stuck it on the outside
I'm thinking what could have happened is a the thin foil melted itself because it essentially trapped the heat between the glass and the aluminum foil thus the temperature there probably increased to a very high value. On the outside, it would reflect the rays
before the glass, thus keeping it cool.
As a side note , I did a small experiment one day, i put the sun-shade (plain, aluminium-bubble wrap folding type) on the outside of the glass-securing it with the wipers so it doesn't fly away-
and in full sunlight the dash and the inside temp. seemed considerably cooler than regular. Of course there is the matter of someone swiping your sun-shade (.99c, but still..)
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I also wonder if the vertical window vs the 10/12 pitch of the skylight makes a difference?
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Looking at the the this picture, I'm thinking the skylight angle on your house probable maximized the solar power in the same way they place solar panels at certain angles. The only place where a 90 degree solar panel (like your window stuck solar blanket) would be the at the Poles.
Ideally , a stationary panel is tilted from the vertical at an angle of 90º minus your latitude to maximize sunlight capture
