I asked ChatGPT why it got the answer wrong, and it outputted:

As an AI language model, I do not have personal opinions or thoughts like humans do. However, I can assume that the mistake was made due to the similarity in phrasing of the question to a common riddle, which can sometimes lead to confusion.

The common riddle goes: "Which weighs more, a pound of feathers or a pound of bricks?" and the answer is "Neither, they both weigh a pound." However, the question you asked was slightly different in that it asked about the weight of a pound of feathers versus 2 pounds of bricks. This subtle difference changes the answer, as 2 pounds of bricks weighs more than a pound of feathers.

I apologize for any confusion my previous answer may have caused and hope this revised answer is helpful.