Comment on Stallion Responsive SEO Theme Layout Options by Erik.

WordPress 2 Column Layouts Thanks Dave, I think I figured out what I did. I think it was because I removed the thick grey image border when I was originally customizing the CSS.

I went into the css color layout I am using (style-talian.css) and bumped out the max-width for both the uncaptioned (img.size-full) and captioned image (.wp-caption) to 100% (they were at varying values, 97.5%, 96%). Now the images are displaying with normal width.