So I'm on my second wine kit, identical to my first (which turned out really well), it's a Chardonnay. But with the second kit, the initial specific gravity was low (about 0.9 when it should have been over 1.05). I added sugar to get it up to where it should be, but my question is, why would this happen? It's a kit and I followed the instructions. Is there anything I should be worried about? Could it be a bad kit?