On 1/19/2023 A Robo 3 operator got a sample out of a 50 lb bag, then pushed the bag on the belt and made sure it was straight. Operator felt a shift between EE's shoulders/upper back in the process of adjusting the bag. Employee originally reported as an ache and pain. On 2/2/2023 the employee informed management that EE wants to see a chiropractor.