OK. If I understand correctly, you have 12 raw lights (post #26 is a sample). You loaded them into WBPP with "some darks, bias and flats", and the result was the masterLight in post #24, which is badly wrong, and looks nothing like post #26. There does not seem to be anything dramatically wrong with your WBPP settings, so something must be wrong with the "some darks, bias and flats". Could you upload a single raw sub for each of these (one dark, one bias and one flat) from the frames used to generate post #24 (frames that are not from this set will tell us nothing).