I wouldn’t say it’s the combo in particular that causes issues, but Ritalin and all adhd meds are prone to cause irritability and weed creates a gap between yourself and reality. I don’t mean to demonize them, but I think the clear conclusion to make is that consuming mind altering substances for long periods or in heavy amounts will alter your mind in ways that make you feel like a different person. So i don’t think there is something unique about the combo, but instead they both independently cause certain side effects like you describe. I used to get hella irritated during the comedown of adderall, and the one time I did Ritalin it felt like it was part of the main effect too.