Arduino nano every working bad with 135x240 screen

Hello. I have bought a nano every with a 135x240 display. When I upload the example from adafruit library, it works but really bad, the colors are nor good and the text in unreadable. But when I upload the program again, for a second, when its uploading, the last image of the previous program appears clear and fine. A second later the new program is show but really bad again... Any idea ?

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