Originally Posted by NikkiLu
Are you sure that you are sewing with a 1/4 inch foot? I had that problem with some precut pieces from a quilt shop years ago - swore that they cut the pieces wrong - come to find out it was MY machine/foot.
HTH
This was one of my thoughts. If this is so, you go unsew the seams, iron the fabric and then resew.
There are several tutorials about how to check to see if you're sewing an accurate 1/4 inch seam. When you first sew you should've been instructed to sew a scant 1/4 inch. This is 1 or 2 threads shy of the 1/4 inch. I believe there might be a You Tube video.
You could also follow some of the other suggestions given.
Pam M