I'm a Chinese Hong Konger with 3* on my ID card and have a HKSAR passport, I am just the most ordinary Hong Konger.
One possibility of the rejection might be my education, I am 1 semester away from my university graduation. Would they finally decided I'm not qualified because of this? But I see many people applied during their first/second year in University and are still shortlisted. I guess if they invited me then reject me, the reason behind should be some solid and factual reason, not my enthusiasm.....