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.

All fixed now :)