Iphone x ghost touch issue

iPhone X Display Module Replacement Program for Touch Issues - Apple Support

Details?

Ghost touch is occasionally software related, but more often it's hardware. If it's hardware the main causes are a failing digitizer (the thing that captures touch on the screen and converts it to position), a flex cable that may be partially disconnected, or the touch control chip failing or with broken solder connections.

You can have it evaluated, but where to do that depends on your location.