I ordered three of the 4x4 fabric beds. The instructions imply the vertical supports are 18” tall. Actually it says “18’?” In pale, hard to read green ink. These were too long. See photo. The correct length was 16”. Fortunately, I only cut four before I tested them in the fabric. The instructions I received showed an eight foot long bed. Did I just receive the wrong set of instructions or do the universal instructions have the wrong measurements? Some more precise instructions would be more pro...