On Invisalign last tray but have gaps between top and bottom molars meeting when mouth is closed - is this normal? (Photos)

I am on tray 19 of 19. I technically wrapped up this tray 2 weeks ago but dentist told me to wear until 11/1 for teeth to settle. My wonder is that when my mouth is completely closed there is a gap between top and bottom molars, they don't touch all the way down the back. Pre-invisalign my teeth did meet fine. Is this still a bite issue that still needs to be corrected or is this normal? Is this a cause for refinements? I used the treatment to correct a right side crossbite and crowding.

No doctor answers yet