Giant Eagle Supermarket

I was checking out and had bought groceries and four six packs of soda which I had put up on the belt. The cashier finished with the person in front of me and then proceeded to tell me that I had to put the soda back in the cart. I was surprised by this request and did it. Why she didn't say something when she saw me put the first one on the belt I don't know. I thought that was very rude. I am a senior citizen with arthritis in my hands, I would have gladly kept them in the cart. Management needs to have a talk with their cashiers, once I had them on the belt she should have rung them up.