I just discovered on my phone that if I tap on the pictures, they go from elongated to normal.
And I discovered when you click on a picture on your computer, it will enlarge to it's original size.
The forum software automatically shrinks photos to fit on the page properly. It is maxed out at 610px. Also, if the person that posts it puts in a width (ie width=310) as many of us do for numerous reason, when you can click the image it will enlarge.