Yeah I am also leaning towards it being a genetic issue. Now, as for the twisting at the ends of your leaves, that (I seriously doubt) is anything genetic. I just can't seem to remember what causes that. Honestly I wouldn't stress over either or of the issues, of course keep an eye on them, but as long as the plant is a healthy green then I think you're good to go. Just keep an eye on those leaves twisting and all, and if any yellowing, discoloring, or other symptoms pop up just let us know.