Great Granny Bars 12" Square

Here is Square #5 of the CAL that I'm doing. I used this pattern http://xxcatalopexx.blogspot.com/2009/08/12-great-granny-bars.html . I really like this pattern, but my square does not look "exactly" like the pattern. This is because my other squares are not turning out the same size. I have no idea why. So...I had to modify this square a bit to make it similar to the others. However, I still like the way this square looks. I used Red Heart worsted weight yarn in Black.