Every photo I import is showing up dark and with a different histogram than the RAW file. When the picture first appears during upload it appears correct for less than a second then is exposure is lowered. Here's what I've already done:
Checked to make sure Lightroom Preferences auto tone wasn't selected.
Hit restore on a brand new import to see if there was an adjustment applied
Hit shift+restore with no results.
When raw images are first imported into Lightroom the embedded JPEG preview is displayed. That JPEG previews can be affected by various in-camera settings the Lightroom does not read. Some cameras have special settings that will impact exposure. Specifically, Nikon has active D-lighting which can affect exposure. After the raw images are loaded into Lightroom, Lightroom generates its own preview of the raw image data. And Lightroom does not read those in-camera settings. So the change in the image is a result of Lightroom switching from the embedded JPEG preview to the Lightroom-generated preview of the raw image data.