First frame sepia on batch BW conversion

Hello, I am getting an odd case where upon batch conversion of a whole roll of Black and White, the first frame is always sepia, while the other 35 frames are fine. I have not seen this in V2.1 and the new V2.2. I use the default settings, feed in .NEF files from a D850 and now I have 5 rolls with the same issue. While they actually look quite nice, it is not what I expect to see. Anyone else seen this?

Tanks, David