Oh, my dear quilter I reach out to you!!!! I was so confused when I had cut and sewed correctly and when I came attach one to another, not even. I think it was my pressure foot. It was a quilt foot that had an edge on the right side that was "Suppose" to be the needed 1/4". It was hard to tell just where I was at when sewing. So I took a Sharpie and measured from the needle out 1/4" and marked the end of another pressure foot. This has worked really well. I got through the quilt and it is now done. Turned out really well. It was my second quilt.
Hang in there.
Rita