Some raw conversion applications will open up the raw image and automatically apply pre-configured adjustments. You can disable these adjustments and change to a setting usually called "As shot" (depending on the program you are using).

The monitor also only shows 8-bit, so the 4096 shades per channel don't show on it either, rather, you see the 8-bit duplicate of a 12/14 bit image (256 shades per color channel). But thats irrelevant to the exposure.

What raw conversion software are you using? Mfr provided or PS or something else?