Hello there. So, i was taking a long exposure during the twilight hour (the sun was set like 40 minutes before) and on the two 200seconds exposures I took, I got some light artifacts on the photos next to some light sources. I also took a couple of 60'ish seconds exposure and the images were clean. You can see the artifacts above the bridge lights. It's like a trail. So, does anyone know why this happens and how to avoid it? I was using a Canon 750D with a 10-18 lens. No filters. Thank you for your help.