Many cameras with built in flash will be affected by ‘lens shadows’. Even expensive DSLR cameras can suffer from lens shadows when using the built in flash.
The nearer that the flash lamp is positioned to the lens and the larger the size of the lens, then the more pronounced the problem will be. The position of the shadow will also vary depending on the location of the flash lamp in relation to the lens.
This is not a fault and cannot be rectified.