Hi new to wine making have made kits turned out ok but a bit thin. Have just started a herbal tea bag wine and the neck of the dj is full of brown gunge looks like the yeast collected at the top this didnt happen with the kits is this normal? i have taken the bung out and gave it a clean then put it back i also gave the dj a shake but did not budge the brown stuff. The wine is active enough can you advise thanks