Hello ,
Thank you for posting in the community and sorry to hear about the troubles. If DOF is off maybe you have something else affecting this export, please check on the more options of the image and camera setting to confirm DOF is off?
If the behavior is till there we would need to take a look at your file and the settings you have setup. Please submit a bug here: https://twinmotionhelp.epicgames.com/s/case-community-page
Kind regards,
Vincent B.