The phone undergoes rigorous professional testing before leaving the factory, so you can use it with confidence. Ghosting of text when scrolling on OLED displays is a normal phenomenon. You can try manually adjusting the refresh rate to a custom 120Hz or adjusting the font to a finer setting to reduce this phenomenon.
To set the refresh rate on your phone, please refer to the following steps:
Go to [Settings] >> [Display & brightness] >> [Refresh rate] >> tap [Custom] >> select [120 Hz].