Fitbit users - help!

Lindsayrob

So after months of inactivity I've returned to the MFP fold. I've dug out my fitbit and plugged it in to charge - it's taking ages> But the curious thing is I've just got an email congratulating me on my first 125 floors badge!
It's dated today, and I haven't even put my fitbit on today - all it has been doing is sitting on the table with my laptop.
I'd love to think it was exercising on my behalf, but I'm doubtful.
Anyone got any clues to what might be happening?
Thanks very much,
Lindsay