I tried this plugin on a template using the php code and it displays images correctly.
You can see it here: http://www.everydaydelicious.com/category/everyday/
Then I tried using a shortcode in a Page, and the first column is producing some weird dots around the images - like bullets. This pushes the first column down and out of alignment with the rest of the columns.
You can see it here: http://www.everydaydelicious.com/recipe-index-2/
I have no idea how to fix this. I tried disabling all other plugins to see if it was a conflict, but it still did it.