PinBoard switched something on me.

Hey guys, I’m using the PinBoard theme and last week, seemingly out of the blue, it has started displaying the Blog Preview image differently.

If you go to http://secondsightstudio.com/blog/ you’ll see that two posts ago, it was displaying the full width image. Now, for the last two posts it’s showing a taller, cropped image.

As far as I recall I haven’t changed anything that would cause this but I’m not even sure where to start looking. Can anyone point me in the right direction?

Thanks!