When sewing square rows together, the row on the top should have the seam allowances facing the foot not away from the foot. I know it is tempting to put the top seam allowances away from the foot but that will push the top row further and further along. I use a straight pin to hold the seam allowance as the foot comes to it ( so the foot doesn't catch it) and this method will lock the intersection against the bottom seam allowance going in the opposite direction on the bottom row.