The cream squares on each end of the brown need to be redone. The seam needs to be exactly 1/4", and sewn to a very careful point at the edge that joins to the red. This is where the careful 1/4" seams are so important so that when you do the next 1/4" seam everything joins like it's supposed to. Read the instructions again...maybe it gives the dimension of the brown on the edge that sews to the red. You can check it before you try to sew it again. 1/4" from the edge it should be the same width as the red. You can check it that way. Then carefully sew the 1/4". It should work. ;)