I'm guessing that you're eyes aren't crossed...
Sometimes a mirror will show a slight second image due to reflection from the glass front as well as the silver back. Is there any chance that there is some treatment that is slightly reflective on your windshield inside or outside that is adding a ghost reflection?
Our head's up seems pretty clear compared to your photo but that may also be the nature of the photo. Maybe finding out how the projection of the display interacts with the windshield could provide a clue.
Paul
Sometimes a mirror will show a slight second image due to reflection from the glass front as well as the silver back. Is there any chance that there is some treatment that is slightly reflective on your windshield inside or outside that is adding a ghost reflection?
Our head's up seems pretty clear compared to your photo but that may also be the nature of the photo. Maybe finding out how the projection of the display interacts with the windshield could provide a clue.
Paul