Why would my Oil filter cap melt? on 2007 Honda Civic Si

I went to change my oil in my 2007 Honda Civic Si and when I took off the oil cap the inner ring of cap was melted? Does anyone have any clue why? has anyone experienced this before? Is it major

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1 answer
Could it have previously fallen down and sat on the exhaust manifold during a previous oil change not done by you.