Images shrinking before my eyes!

Our site is using “Magazine Basic” theme which was just updated late last week.

Since the update, our photos are shrinking before our eyes when we view them on mobile (well, my iPhone). I’ve never seen anything like it before! If you wait long enough, the image will completely disappear.

Any ideas what could be causing this?

(This is what it looks like: https://www.dropbox.com/s/07ilq9gu21v707n/Video%20Aug%2010%2C%209%2058%2005%20AM.mov?dl=0 )