Why the Linear Light seems to appear around Light Source while Capturing a Picture?

It’s normal flare phenomenon and it can occur when shooting under backlight that sun/light is located close to screen frame or fingerprint/foreign matter gets on the lens.

Especially, when you take a shoot of objects around bright lights, you can easily find it. At that time, please specify where sun is not so close to the screen or check again once you have removed the foreign material on lens (As foreign matter can remain according to wiping method, please wipe the lens in a circle around to remove the foreign material completely) It may differ slightly by lens specification and foreign matter on a lens.