Here is the test I used. I want to be sure I don't confuse anyone. I copied this from a post on the Board by bearisgray:
Do a test to see where the problem might be:
1) Cut three strips of fabric 2 x 5 inches long
2) Sew them together with 'your' 1/4 inch seam
3) Press
Measure - the unit should measure 5 x 5 inches - and the center strip should measure 1 inch wide