OnePlus India — one plus 7 pro security issue

I have been using one plus 7 pro for a time now.
I have added my both thumbs fingerprints and my face as two phone unlocking assets.
And the twist is someone is also able to unlock my phone through faceid.
How is this possible??
I might have lost some confidential statements!!
This is a huge fraud oneplus has done!
This is just not acceptable and simply a case of personal information hacking aka cybercrime.
All my information has been leaked out!