Tighten it up a bit by lowering the rod from its vertical position by only 45 degrees each direction. Your wide loop will have decreased in size. Try one more time and rotate the rod downward by another 20 or 30 degrees. Again, your loop is more normal looking. For casting graduate students, go through this same exercise, but do it to your backhand.
Some people have a horrible time trying to cast a narrow loop.
If you have ever tried fishing for bass and bluegill, you will understand the importance of a tight loop. Because the fish lie on the edge of the weeds, you must accurately place your fly on their food table. I watched Randi Swisher of Sage Rods win the International Sportsman's Exhibition Casting Accuracy Contest, beating out 600 other contestants, by forming a very tight casting loop and hovering his yarn over the target. He registered the only perfect score. The faster you speed up and then stop the rod during the power phase of your casting stroke, the narrower loop you will form.