When you say a few signs of fermentation, you are probably referring to bubbles and apparent movement in the fermenter, right? If you've hit your terminal gravity (i.e. you took several gravity readings over a period of a week to determine the gravity hasn't changed) then it probably won't ferment any more. What is most likely happening, because you said you transferred only a little while ago, is that you are simply releasing some CO2 that was in suspension in your beer from the fermentation. If you said you saw visible signs of fermentation a day later, I might think that the act of transferring could have put some more yeast back into suspension (if you got a bunch of trub into your siphon) to restart fermentation, but I don't think that is the case.
TL;DR - you're fine.
Primary - 1 Gal JAOM, Belgian IPA, Pumpkin ale
Secondary - 5-way split Breakfast Imperial Stout, 2 Gal Traditional mead
Bottled - Kolsch, Pliny the Younger clone, Centennial Blonde, Alpine's Nelson clone, Apfelwein, QuicknDirty Cider
On deck - EdWort's Haus Pale