You racked too soon that's why there is fermentation happening. If you choose to rack to a secondary vessel, you should wait til fermentation is complete. And you determine that NOT by a calender, NOT by airlock bubbling, BUT by taking 2 consequetive HYDROMETER readings, three days apart. I usually recommend the new brewer not even tak their first reading til it's been between 10 and 12 days since you pitched the yeast.
If you arbitrarily move your beer, like to follow the silly 1-2-3 rule, you will often interrupt fermentation. Because sometimes the yeast won't even begin to ferment your beer until 72 hours after yeast pitch, so if you rush the beer off the yeast on day 7 then you are only allowing the yeast a few days to work.
Besides, fermenting the beer is just a part of what the yeast do. If you leave the beer alone, they will go back and clean up the byproducts of fermentation that often lead to off flavors. That's why many brewers skip secondary and leave our beers alone in primary for a month. It leaves plenty of time for the yeast to ferment, clean up after themselves and then fall out, leveing our beers crystal clear, with a tight yeast cake.
Never go by airlock activity.....or a calender...
The only way to truly know what is going on in your fermenter is with
your hydrometer. Like I said here in my blog, which I encourage you to read,
Think evaluation before action you sure as HELL wouldn't want a doctor to start cutting on you unless he used the proper diagnostic instuments like x-rays first, right? You wouldn't want him to just take a look in your eyes briefly and say "I'm cutting into your chest first thing in the morning." You would want them to use the right
diagnostic tools before the slice and dice, right? You'd cry malpractice, I would hope, if they didn't say they were sending you for an MRI and other things before going in....
Thinking about "doing anything" without taking a hydrometer reading is tantamount to the doctor deciding to cut you open without running any diagnostic tests....Taking one look at you and saying, "Yeah I'm going in." You would really want the doctor to use all means to properly diagnose what's going on?
And read this for the latest info on not using a secondary.
https://www.homebrewtalk.com/f163/secondary-not-john-palmer-jamil-zainasheff-weigh-176837/
Just leave your beer alone in secondary now for another 2 weeks...give it time to do it's thing, and next time don't be so quick to rush your beer.