How very disappointing. Obviously someone did not do their job right. I would take it back. No one should expect HALF of the fabric!
This reminds me of a purchase I made at Walmart one time. It was a panel of an American flag. And someone had cut it wrong last time, so when the person helping me went to cut one panel - it was with the blue field at the bottom of the stripes! I had to really argue to get her to toss the fabric in the center, and begin my cut so the blue was ABOVE the stripes!