happens at https://zh.wikipedia.org/wiki/%E5%95%86%E8%A1%8D%E9%8E%8F
file: https://commons.wikimedia.org/wiki/File:%E5%95%86%E8%A1%8D%E9%8E%8F.jpg
same thing also happens to png and coloured jpeg.
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i also tested with a coloured jpeg https://commons.wikimedia.org/wiki/File:Manchuguo_Poster.harmony_of_J,C_and_Mpeople.jpg
also turned into negative.
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This is caused by the Infobox template: https://zh.wikipedia.org/w/index.php?title=Template%3A%E4%B8%AD%E5%9C%8B%E5%8F%A4%E4%BB%A3%E4%BA%BA%E7%89%A9%E4%BF%A1%E6%81%AF%E6%A1%86 which adds class=skin-invert to images. You should use a parameter to chose when to invert and when not to invert instead of always inverting.