Purple/red stems and petioles on upper growth, mimosa x orange punch. I think the plant looks otherwise healthy, lots of growth. Genetic expression or cal/mag deficiency?
Some strains will have purple stems - I don't know about this particular one but if the plant looks/acts healthy otherwise, I wouldn't worry about it. I don't see any evidence of a deficiency so I don't think you have anything to worry about!
Good luck!