White value issues on rendering

This has probably been discussed before but I wonder if someone could help.
Whenever I render out (it doesnt seem to matter what format) my white values in Nuke read as just under 1 for some reason.
Is there a setting in Mocha that I am leaving unchecked or something?

Hi floriferous,
This is a bug relating to 16-bit projects which will be addressed in the upcoming 2.5.3 update.
Send me an email and i’ll get you on the beta: