Hi all, first time mead here, been brewing beer for almost 15 years. I'm doing a small one gallon batch of mead to see how I like it. It's been sitting around since Jan., looks nice and clear, 13.2% so I thought I'd bottle it. Transferred it from a small demijon to a jug and added potassium sorbate and potassium metabisulphite so I could back sweeten it just a little. Let it sit over night before I added more honey and I have a full rise of my airlock and some tiny bubbles. Shouldn't the two chemicals have killed everything off? Looking for some guidance/opinions on what to do next since I thought there would be no more activity. Added 1/2 tsp of potassium sorbate and just a pinch of the metabisulphite (directions said 1/4 tsp for six gallons, im only doing one gallon.)