It looks like the centers don't meet because the dominant colour of the strip along the edge is changed when cutting out the triangle. So light strip on one piece is meeting the dark strip on another.
If you want to off set them though it would be simple to do. Over cut your triangles, sew 2 together to make half the block, sew 2 more together and then move one half down to the desired off-set, sew the halves together and trim the block to the desired square.