White Rectangle Within Photo

I’m having an issue with a white rectangle appearing above or below a photo, still within the border, on one of my posts. I don’t know what it’s from as it’s only occurring on a few of them. You can see the problem here —- https://www.imderekhart.com/2012/07/06/its-wedding-season/

I have a feeling this is an easy fix, but I’m new to WordPress so any help would be greatly appreciated!