If you see a gap in between the TV and the neck of the table stand, it means that your table stand is not correctly attached to the TV.
Place the TV face-down on a flat, stable surface, with the stand faced towards you.
Remove the stand from the TV by loosening the 4 screws under the table stand with a Phillips screwdriver.
Place the stand upright, with the top opening faced towards you.
Make sure that the 4 screws do not stick out from the openings.