WordPress.org Gallery Problem

I have a problem relative to galleries. When you insert the [‘gallery’] code in a page, my images are getting messed up. Here’s an example of what is happening: I upload an image (after the [gallery] code is set), and since Galleries naturally make images thumbnails, I didn’t altar the file; I simply put “Full Size” and I took out the additional html that also makes it a link (since the gallery code makes it clickable anyway). But when I viewed the page and clicked the thumbnail, the image wasn’t it’s full size! In fact, once I clicked the initial thumbnail, once I went to the page, I had to click it again. I want to make it where once you click the thumbnail, the image is it’s full size (without it being another link), so people can view the full size image and post in it. If you view this page you’ll see what I mean. Just click an image from the page, and you will notice the problem.

I doubt that it has anything to do of how I uploaded it, but then again I do not think there is any special option in the media section of the dashboards either. So could somebody please help me? I am at a loss here, and I still have much more work to do currently.