I am attempting to make a Trip Around the World quilt using the method where you cut 45" strips and sew them together and then cut that into 4 1/2" blocks. When I went to cut the sections into the 4 1/2" block strips it is so crooked it comes out on the bias. I was very careful cutting it out. Used 1/4" seams. What did I do wrong? More importanst how can I fix it? I have no more fabric as I bought this in a kit several years ago. I remember now why I don't like to piece tops. This is supposed to be a wedding gift for my grandson. Thanks in advance for any advice.