Iphone 6 camera light spread issue

I Am using iphone6 with ios 9.2 in it.

recently i have obsrved that whenever i take pictures with light source in it, the lihht coming out from it spreads up. I have compared the photos with fellow iphone 6 users. They do not have this issue.

i Have tried HDR mode but no use.

i Am attaching a sample photo to illustrate the problem. Please suggest a solution