Images not centering

Hi Everyone,
I was wondering if someone could help me out with this. I’m having an issue with images not being centered in blog posts, it appears to be something to do with captions as images without captions appear to center just fine. I’ve tried using the built in alignment, used the text editor…nothing. The only thing that works is using a DIV alignment, but that’s a real pain in the neck for each post. I’ve looked through the CSS but my weary eyes may have missed something or looked over it. Any ideas would be greatly appreciated.

The blog can be found at https://www.christopherdrummond.com/cdbblog/

Thank you all so much in advance!