The phenomenon known as "ghost touch" results from a bad connection between the digitizer and the motherboard, allowing signal noise on the line which gets interpreted as touch inputs by the processor. The interface between the glass the digitizer circuitry is printed on and the flex cable going to the motherboard is delicate and easily broken. Unfortunately, it's not repairable so the only solution is to replace the screen. Assuming you have the same phone as the original poster, you can use the instructions given in my answer to fix your phone.
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Here is a link to that answer.
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[link|https://www.ifixit.com/Answers/View/869359/Phones+display+is+not+working?permalink=answer-869369#answer869369|Phones display is not working - oneplus nord ce 2 - iFixit]
The phenomenon known as "ghost touch" results from a bad connection between the digitizer and the motherboard, allowing signal noise on the line which gets interpreted as touch inputs by the processor. The interface between the glass the digitizer circuitry is printed on and the flex cable going to the motherboard is delicate and easily broken. Unfortunately, it's not repairable so the only solution is to replace the screen. Assuming you have the same phone as the original poster, you can use the instructions given in my answer to fix your phone.