Hi Nicola,
Thanks for your review. We are pleased to hear that you are enjoying the barbecue and sorry to hear of the issue experienced.
We have only really heard of problems such as is where the wood burning oven has been overfired. That being said, if you would be able to send some demonstrative photos and your order details to customerservice@directstoves.com, we will be happy to investigate this for you.
Please let us know if we can offer any other advice or assistance in the meantime,
Kind regards,
Direct Stoves & Fireplaces