Photoshop Blur Gallery (Iris Blur)

I am watching a video tutorial on using the Iris Blur, and when they click on the Iris Blur a pin automatically appears on the image.  The "lines" around the pin are all a perfect circle, but when I click on Iris Blur, all of the lines form the shape of an oval.  I am not having any luck figuring this out!  Thank you!  Diane