On the page <https://breezewiki.com/bandori/wiki/Wish_Upon_a_Tanzaku/Event_Story>, the image <https://static.wikia.nocookie.net/bandori/images/7/7e/Wish_Upon_a_Tanzaku_Worldwide_Event_Banner.png/revision/latest/scale-to-width-down/660?cb=20180608114227>, heading the page, appears vertically stretched. Other images on the page render correctly. This has been tested in Debian 10 on both Pale Moon 31·3·1, where the image is stretched so much as to occupy half the page's height, and Epiphany (GNOME Internet) 3·32·1·2, where it is ‘only’ stretched to thrice its proper length. A friend running LibreWolf on Debian 11 reports stretching also.
Thanks for the report, I found the issue.