I googled Quilt Doodles Bom to see if I could help, but I wasn't able to figure out exactly how it worked. It sounds like you are concerned that it wasn't quite as wide as you though it would be. That would just mean you made a bit larger seams than 1/4. I wouldn't worry about it. Just sew up the next rows, sew them all together, and you will see that you still have a workable quilt...just a bit different size than it said it would be.
Quite often mine don't measure what the designer said they would. Just call it creative thinking, and quilt on. No quilt police will ever show up to measure!!
Hang in there. It will be okay.
Dina