This happened to me many, many years ago with semolina. I used to make syn free semolina pasties...they were delicious!
I had just made a huge batch when my Consultant called me to tell me that semolina now had a syn value!! I was gutted.
She suggested that I finish the batch that I had made and to see how my weight loss was that week...I lost 4lbs....I didnt make them again after that though