Your node connects via Tor *and* your regular IP by default IIRC. To run it only through tor, try using the commandline `-proxy` argument
Well according to what I did read, after version 0.12 or something like that, Bitcoin Core would automatically configure itself to route all connections throught Tor if you had opened Tor Browser before opening Bitcoin Core... but according to the wiki it tells you to do that:
https://en.bitcoin.it/wiki/Tor#GUIIm confused now. I will try to find where I did read that you didn't need to do that anymore.