iPhone 13 Camera Quality

This is called Lens Flare and is normal. You can angle the camera differently relative to the lights and see the flares move or even disappear. The more capable a camera system is, especially at night, the more you will notice these artifacts. Even $45,000 Medium Format Cameras are not immune.

This is normal for cell phone cameras, from Samsung, to Google and so on. It's normal for DSLR cameras from Nikon and Canon. It's normal for very expensive camera systems from Hasselblad. It's normal, period. You can go out to all manners of forums and see user complaints of Lens Flare on Samsung Phones.

The lens flare you see in the photo you showed, was clearly on your iPhone screen before you took the photo. You just didn't notice it until you took the photo and had more time to look at the photo you'd taken. Be aware of lens flare when taking night mode photos and try to re-angle the camera and you'll see the flares move and angled well, disappear.

I'm not going to argue with you here. Lens Flare is normal, whether you'd like to agree or not. There are so many threads on this and photos from Samsung to Google to just about every other high end phone camera system shows Lens Flare.

If you think your phone is defective, feel free to schedule an appointment at your Apple Store Genius Bar, but they are going to tell you there is nothing wrong with your iPhone.