Why do certain emails scroll continuously down in the Outlook.com Android app?

I get a Sky Sports Newsletter email that displays fine on the web outlook.com, but when I look at it using the Android app the contents of the email disappear off the bottom on the screen. The background image is displayed but the contents keep scrolling further and further down (you can just about see them if you keep up by scrolling manually). The scrolling indicator on the right hand side just gets smaller and smaller as the size of the email effectively keeps increasing as the email contents continuously move down.