Different people carry different assumptions with them throughout their lives. Not everybody approaches a logic puzzle with the mental preparation of solving logic puzzles. They aren't looking to analyze the statements and they don't carry the assumption that the statements carry just enough information to solve it. Instead, they might expect some trick or play on words to give a "stupid" answer.

because I had no trouble understanding the wording of the puzzle

But you do have trouble understanding that other people might be different from you; with different experiences, assumptions, etc.