So I've had my Skeeter Pee going now for a while. I Racked, Stabilized, added Fining per the recipe a little over 2 weeks ago. Pulled a sample last night to measure for back-sweetening (have had no change in SG). As I was checking I found what looks to be "Yeast Rockets" and some bubbling. No where near enough to move the airlock. But now and again I can see decent bubbles coming up and sometimes they have a chuck of sediment. This "Yeast Rocket" leaves a trail thru the wine and once it breaks the surface drops back down. I def noticed it again tonight and I haven't touched it yet. I've got my syrup ready to back-sweeten but held off till I could get check. Is this a normal function?