WordPress is resizing my images

I just added a page to my site. It’s the first page I’ve added with full-width pictures. The width of my content is 1200px, as is the width of my images. When I added the images, I told it to use full size, and it displays as a 1200px wide image in the edit window, even the code in the <IMG> tags says “width=’1200′”, and yet for some reason, all of the images on that page are getting shrunk to 1000px wide.

When I view the code in the debug window of Chrome, I can see that the src for the images now has “?resize=1000%2C148” appended to it. For the life of me, I can’t figure out what’s causing this. I appreciate any insight!

Here’s the page in question:

http://www.hope68.com/get-involved/penny-war/