Used work fine with iphone 5s but with iPhone6 some distortions are seen

I did not notice any distortions when I used this app with iPhone5s.
However, recently, the app makes some strange distortion. It looks as if iPhone had a wide angle lens and the picture is taken on the edge of the viewing angle. I dont know how to call it professionally (maybe barrel distortion?).

Please fix this issue!

vaindual about Cortex Camera