It looks like when you made the block your seams were just a little bigger than a 1/4 inch. If you measure the distance from the point to the edge of the seam it should be 1/4 inch. Then when you sew it to the next block it will have the point right at the edge of the block. If all of them are made, I would say just put them together and don't worry about it as long as they are all the same. If some are different size seam allowances you could run into trouble as it gets bigger.
Sometimes it's just a slight adjustment to your sewing line that can make all the difference. Do you think it would help to have someone else measure them and see if they are actually 1/4 inch? I know that is what helped me.