Thanks. That photo helps. That is really weird.
As another way to test the display, try downloading the precompiled example from here:
https://learn.adafruit.com/adafruit-clue/arduino-testDownload the UF2 by clicking the green button that says CLUE_TEST.UF2.
You don't need Arduino to actually run the example. Double press the reset button on the CLUE to get the BOOT folder to show up, and then drag the downloaded CLUE_TEST.UF2 file to the BOOT folder. It'll reset and run once the copy is complete.
Any change to the screen?