When adding an image to the detailed descriptions, they can overflow the content area if their native size is that large. Adding some theme CSS that sets the max with for images in the description should probably fix this.
To replicate, add this to a detailed description:

When adding an image to the detailed descriptions, they can overflow the content area if their native size is that large. Adding some theme CSS that sets the max with for images in the description should probably fix this.
To replicate, add this to a detailed description: