Images are not aligning properly

I recently changed my theme and chose this one. Thanks so much for such a well-designed theme! However, I’ve had difficulty with some of my images. Some of the photos are not center aligning–what’s interesting is that it is not affecting all photos on the site. They’ll move left and right, but are slightly off-centered when I choose to align them centered. Any ideas?

The photo above the list shows what’s I’m writing about. https://adventurefilled.com/cotopaxis-gear-for-good-is-quite-good/?preview=true&preview_id=3353&preview_nonce=1de1bc9c5b

Thank you!!