[Theme: SimpleCorp] Image Captions Disappearing

Before inserting new images into my posts I add in my caption in the “Attachment Details” window of the Media Library. Once I insert the image into my post however, the caption is gone. I’ve disabled the SimpleCorp theme and activated the 2014 theme and the captions appear. Any idea why it’s not showing in SimpleCorp? It used to work fine.

Thanks!