no idea. i would imagine it should say 12..
though....are you using nvidia hardware? it says... disable mfaa to see dx12.
https://forums.geforce.com/default/topic/860540/geforce-900-series/windows-10-dxdiag-show-directx11-3-on-gtx-970-please-help-/
http://www.tenforums.com/software-apps/9709-direct-x-11-3-overwrote-12-a.html