It's most definitely a double flare, the outer edges do that little splitting when I don't sand the outer edges at a 45 before putting the 2nd flare in.
I replumbed my whole car with a rolled line from jegs , about 10 yrs ago, didnt put not one split flair in , if they split they aint right , after 50 plus yrs of being a plumber , I think I got this right .