Due to the layer overlay blur processing algorithm, when there is a significant difference in background brightness, such as when pulling down the Notification shade or Control center, the layer overlay can produce some stripes or ripples.
These visual artifacts result from uneven transitions in the overlay and are not indicative of a hardware issue. This phenomenon is being actively addressed by optimizing algorithms to minimize these effects. Please rest assured that this does not affect the device's overall functionality. Please continue to use your device without concern, as improvements are underway.