UFO Sighting in Fremont, California on June 15th 2015 – Took pictures of the sunset and later saw half circles that don’t quite match up with lens flares

I was driving home from work at 8:16pm, I had crossed the Dumbarton bridge and was heading north on Paseo Padre in Fremont CA at about 50mph when I got the urge to take a picture of the sunset in the west to my left. As I continued driving, I rolled down the window and snapped a few pics with my iphone and forgot about it until the next morning. When I saw the pictures, Upon first glance, I thought that the yellowish, solid, half-circles were simply lens flares. However, I have never seen half circles as lens flares, they are always solid shapes. Also, the image appears to move in ways that don't correspond to lens flares from image to image. In all the photos I see online with lens flares, I have never seen a half circle or half of a solid shape. My lens was clean with no water or streaks. In some of the photos it does appear to be simply a lens flare. However, the shape and placement just don't add up so I have decided to let you decide for yourself.