Help: Passive Skilltree has more then 2Sets?!

Hi all,

I am relative new to the game but really investigated.

I am confused about a "mechanic" related to the passive skill tree. Please have a look at the Screenshot.

Link to Screenshot: https://pasteboard.co/UOqA3eSfnXKv.jpg

Blue circles: weapon set 1
Red circles: weapon set 2

All fine so long. But now it gets wild...

Green circle: ???

Can someone explain me why I am able to set the five additional points in the green circle? I don’t understand this „logic“. I double checked my stats with and without this five points... nothing changed... in my view.

Regards
T