I would say your panel is busted. My RP LCD did a similar thing. You can argue whether it's because the panel was defective or you just got unlucky, but it's not burn-in because it isn't related to what is on the screen at all (other than it is more visible at some times than others).
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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I would say your panel is busted. My RP LCD did a similar thing. You can argue whether it's because the panel was defective or you just got unlucky, but it's not burn-in because it isn't related to what is on the screen at all (other than it is more visible at some times than others).