I'm not sure how you put the triangles together, but try this. Cut a green square and a print square at least 1/2" larger than the block is suppose to be with the seam allowance. Place them face together, draw the line from the left top corner to the right bottom corner. Sew scant 1/4" inch on both sides of the drawn line and then cut down the middle. You will need 4 of these to make the whole block. Press the seams and trim to the size you want them to be. I hope I have confused you.