Are you using W&N?? I don't think there is a right/wrong side on Hobbs 80/20.
http://www.warmcompany.com/warm-faq.asp
› Is there a top and bottom side to Warm & Natural?
If you hold your Warm & Natural batting up to the light, you’ll notice that one side has flecks in it, natural leaf and stem remnants from the cotton plant. The other side does not. The side with the flecks should face your quilt top. The reverse side (without flecks) will go towards your quilt backing. (If you do not like the look of the cotton remnants showing through your quilt, I suggest our product Warm & White which uses bleached cotton.) This is not required, however it does make it easier to sew through scrim.