Non OEM Screen issue

hi guys, i just purchased screen on ebay from the seller " GadgetFix " and i installed it, it is working great, but i just noticed that when i take selfie with Flashlight, screen flashs, photo is taken, then camera is watching me in live, it works, but ! everything freezes, touchscreen, buttons, vibration, lock button, home button, can't do anything before i force restart the phone... i tried now another screen wich i took from another phone, it is new, it is oem, and it worked great, even when i try to take selfie with flash, it works great, so technician said that this problem was caused by non OEM screen... seller is not accepting return, i haven't got more money to buy new one, i need screen, how can i fix this one? 3D touch works great too, it looks like original one if there wouldn't be that one defect on selfie flash... help me guys please