Thanks very much for your message. We don’t use a chemical leavener. All our breads are sourdough, made with naturally gluten free grains. Our breads are simple, a range of gluten free flours, tapioca starch, potato starch, xanthan gum, salt and the sourdough. We’ve never had this issue before, and we’ve been baking for 4 years. It’s just suddenly started happening.
I hope this helps, but please do let me know if you need more info
thanks For your help.