That is n issue we see occasionally with the 25oz. The yarn is so wide that the button hole stitch perfectly goes over just one yarn (not a good thing). We are working out how to alter the button holer. What has happened to yours is not good, let me chat to Haraki. I did send him an email after you original PM, but did not get a reply, I think he is run ragged getting ready for Bread and Butter. I have hassled him again….G
Was this button hole question ever fixed?