Hello!
I specialize in camera and imaging systems design and manufacturing.
I have experience in camera PCB design, image sensor configuration, firmware development, soc linux camera driver's, etc.
Please, ask your developer to very carefully check register 0x4F01 (Bit[3]) and 0x301E of OV7676 image sensor.
If your developer will not have any new ideas after checking these registers, please, feel free to contact me to discuss your project details.