Default screen issue- VIDEO included for visual explanation

additional note, the screen adhesive is loose also, the phone was not dropped or spilled liquid on.
i realized today that the adhesive was loose when the screen started to behave. when i placed my nail to see how much loose. the phenomenon on the video occurred.

what could be the problem? the flex cable, the lcd itself, or the layers behind the LCD (refractors) etc. i cannot post the full link of youtube. summary, half of the screen if fine, the other half lines of smudged colors