Sherri, when you turn your four-patch to the back to press the seams, use your fingers to lay them in the right direction. (All four seams should go either clock-wise, or counter-clockwise)Sometimes the necessary stitches will come unstitched with just a little finger pressure. If the intersection doesn't want to twirl, you can unstitch the 2 or 3 stitches that are preventing the twirl. You should see a small four patch at the intersection, and can press the intersection flat.
BTW...the twirl WILL NOT WORK if the seams are not lined up correctly when the last seam is stitched. The first two seams should snug up to one another, but not overlap.