FP3 touchscreen experiences ghost inputs

As it is written in the troubleshooting guide of Fairphone, in this case, perhaps you can try:

  • Open your phone dial pad
  • Enter *#*#66#*#* in the same way you are entering a phone number to make a phone call. Once the last character is introduced, the Service Menu appears showing you three sub-menus.
  • Select Service tests > Test Single > Touch screen .
  • Use your finger to draw freely on the screen and check if you can do it in each part of the screen.
  • If you can see blank areas in your drawing, your display is partly insensitive to touch.

I don’t know if it can be useful.
And of course, as @AnotherElk said:

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