Syncthing is syncing files in the .sync directory

After having installed Syncthing to computers A and B, I do see that all the contents of the CA folder that I am syncing to CB are being copied to the hidden .sync folder of CB.

I haven’t found anything in the docs. Is that normal? What is the .sync folder? Have I missed the documentation page?

The .sync folder probably originates from Bittorrent Sync and is definitely not created by Syncthing;)

God, that’s is completely true, can’t believe this has happened to me ~_~