Hi, For my fairphone 4 I’ve experienced the ghost inputs regularily, since a few months. I thought it was caused by the (official) phone case I got in october, but when I took it out of the case it still occurred. Apart from the case I don’t have any modifications to my phone (e.g. screen protectors)
The inputs are mostly in the middle (just as in the few screenshots that others posted). In some cases it clicked buttons that happen to be in the middle, in some cases it zoomed. Most of the time it started scrolling like crazy. Sometimes it swiped down the settings panel at the top