I take this picture with Canon EOS 200d II, 18-55mm IS STM with jpg+RAW setting. When I open RAW in RT (RawTherapee 5.8, released on 2020-02-04) , with default profile auto-match low iso. There is strange color, red and blue line at the bottom see my attach picture. But the jpg that came from camera there is none. Even neutral also reveal some of this strange color line too.
What cause this? Why? What is miss? And how to solve this?