Images on mobile devices

Can anyone explain to me why images in my blog post appear properly oriented on a desktop, but sideways on a mobile device, including cell phone and iPad? I changed the orientation when I resized my image, then added it to the blog post. But for those who view my blog on a mobile device are seeing the one image at the top sideways. The original image was portrait-styled, which had to be rotated prior to saving.

Hope someone can explain to me why this is happening.

https://www.nancygoodalldesigns.com/blog.html