Check your settings. If the bars are that big it is probably florescent lightbulbs running on 50Hz or 60Hz AC power. Most phone camera software quietly filters

Check your settings. If the bars are that big it is probably florescent lightbulbs running on 50Hz or 60Hz AC power. Most phone camera software quietly filters out the bars at this size/frequency. Another notable source is the 60-120Hz refresh rate of a computer screen.