Problem Display replaced with problems - Oneplus 3



I managed to break the display of a Oneplus 3. I found a random GSM in Iasi to replace it (in theory, the original display).

But I happen to have more and more frequent problems with it: usually random touches on the screen as if a ghost were continuously pressing 1 point on the touchscreen.

I spoke with the respective mobile phone and I have to leave it to him for 1 day to 'confirm' the problems.
I'm asking for an opinion here on what they could do. Change the display? Do the work again, maybe something doesn't make contact, ok?