Wide, pink stripe across screen.

Hi! I'm repairing a SM-T810 which I’ve changed the LCD on. There are no damage to the new one whatsoever, but there's this thick pink line across the screen which also displays translucent messy text which says: “Samsung Snart Things Motion Sensor” and also mirrored textmenu that says “Delete, Edit, Share and Favorite”.

Anyone with a good answer to what this issue could be? I’ve tried two different flat cables for the LCD and tried the screen on two separate devices.