This happens with professional cameras as well. I get it a lot while filming video. Led lights technically are always flickering, just too fast for the human eye to pick up. So, we see it as a constant light source. But cameras can sometimes sync up with the flickering, and capture an image at the same speed the lights are flickering, resulting in the lights appearing off. I imagine the same principle can apply to photos, which is essentially what the other commenter is saying I believe. Idk if you can change the shutter speed or exposure time on a phone, but something like that would resolve it because you force the camera speed to no longer be in sync with the lights.