What's wrong with the camera taking pictures with shadows?

You used a flash, didn't you? That's the shadow cast by the flash. Because the flash and the lens are not on the same axis, it will leave a shadow. Solution: 1, turn off the flash, and set up a tripod if the speed is too slow. 2. Try to keep the subject away from the background and let the projection land. 3. In the case of external flash, use reflective flash to eliminate shadows.