Images are not scaling on FAQ page on mobile

Hi everyone.

I have a wide image on my /faq page.

When viewing the FAQ page, the image is not responsive / scaling dynamically on mobile and it runs off the edge of the screen:

Causing much left / right scrolling to occur:

If I view the topic of my FAQ, as if I were going to read or edit it (at https://example.com/t/faq-guidelines/5), the image is correctly resized dynamically, fits perfectly, and no left / right scrolling occurs: