Hardly hands free Qais.
Also, in between the first video and the last video, did you re set the fingerprints stored on the device? Another thing to check, is it set with any trusted locations? What about trusted voices?
I'd still suggest that you reset the fingerprints, then try again. When trouble shooting, it's always best to take one step at a time, and change single items at a time. If you have done all that (which I don't see you saying you have changed the settings) and it's still working, perhaps take it back to the retailer you bought it from, and show them. It may be a one off, it may well be a massive issue that you've discovered, but it needs fully tested and investigated before claiming it as a massive security flaw.
Change the trusted fingerprints and try it again, curious to see how that goes.
Good luck.