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Hi, congratulations on your Ryzen Threadripper build. Unless you have the Ryzen Threadripper 1900X, it should indeed show 16 Cores with the 1920X or 1950X.
Please make sure that you have the correct Ryzen Master app for your CPU; download the threadripper version of Ryzen Master here: AMD Ryzen™ Master Utility for Overclocking Control | AMD
If you have the wrong version installed, make sure you completely uninstall it first before installing the correct version. If/once you have the correct version installed, make sure you do not have Legacy mode enabled or gaming mode enabled.
(I do not have Windows installed on my Threadripper build, so I can not take a more recent screenshot for you, but the above should help somewhat)