Black bars above and below featured image on Facebook but not others

I’m not sure if this is due to Jetpack, WordPress, Facebook, or whom, so I’m not sure where to post this. Thus, I’ll post it here.

When a post is publicized on Facebook, there are the dreaded black bars above and below the featured image (like seeing a wide screen movie on a full screen device).

Example: https://www.facebook.com/photo.php?fbid=10200439904396779&set=a.10200382820409715.1073741875.1731542745

As you can see, it shows that it was submitted via WordPress (I use Jetpack to auto publicize). These bars do not show up on Twitter, Google+, or others. Just FB.

Samples —
Twitter: https://twitter.com/JRothra/status/605155218536284160
Google+: https://plus.google.com/+JohnLRothra/posts/ZwUVUpM8X9h

What I’m using (all the latest, I believe):
WordPress 4.2.2
Jetpack 3.5.3
Customizr theme (using child theme) 3.3.26

My URL: https://www.johnrothra.com