Citation hallucination has four distinct failure modes — fabricated URLs, retrieve-then-misquote, URL substitution, and anchor-text drift. They look the same in the response but they have different causes and different fixes. A field report on measuring citation faithfulness in production. The first time I caught it, I assumed I was misreading the response. The user query was about a specific competitor's pricing. The model produced a confident, well-structured answer with three inline citations. I clicked the first citation. The URL was real. The page existed. The page was about the competitor's product. The page did not contain the price the model had stated. The model had retrieved a real document and emitted a sourced-looking claim that the document did not actually support. Confident, well-cited, and wrong. This is citation hallucination, and once you know to look for it, you cannot unsee it.…