Hi, i made red grape wine for the first time and at this stage my wine is in the secondary fermentation process and is closed with an airlock. I have two 25 litre demijons they started the secondary fermentation at the same time but one of the demijons stopped bubbling about a week ago so i racked the wine from that demijon to take it off the sediment and when checked with the hydrometer it seems that the fermentation is done I also added a dose of campden tablets. My problem is that the other demijohn is still bubbling although very slowly. Is this normal that the same wine doesnt finish the fermentation at the same time??