On 12/31 I brewed my first time with a porter true brew kit. Beginning gravity is supposed to be 1.043-045, final 1.012-014. I started with 1.044. I made a mistake and put the carboy in my basement and it go to cool. I brought it upstairs where it has stayed around 68-70 degrees and it started fermenting again for a few days. My final gravity is stuck at 1.021. On 1/11 I racked it to a secondary where it still sits. I have a little sediment on the bottom now and I'm still stuck at 1.021. A friend who did the same porter kit told me to go ahead and bottle/keg it. Should I? Why wouldn't my final gravity come down?