I started this wine on feb 13. OG 1.102. Pitched with 71b 1122. Racked on 2/23 and removed fruit. SG 1.032 and low activity. Topped up with rasp/apple juice blend. It has been going nuts ever since and accumulating this strange foam on top that kind of sticks to the carboy. I stired it last night and it went away. This morning it is back and still going nuts. This is the first time I have used 71b. Is this normal?