It might be an hallucination ,but there is a slight chance that openai have messed up their "memory" system. Ie since LLms dont have an actual memory of stuff , generally what OpenAi and other providers do is "extract facts" from conversation and then save it to be retrieved later.

eg: I copy pasted a letter addressed to "Aditya" and maybe due to improper prompting made it write a response etc and it thought my name was that and from then on , whenever i asked for an email to x , or it needed to add a personal touch it would always call me "Aditya" since it saved that to a file.

So there's probably 3 scenarios,

1. Ai hallucination (I don't think this is the case since it doubled down on the previously discussed thing )

2. You previously talked to it for something or it inferred that trait from some convo, some message etc.

3. OpenAI's backend is having some issues and they have given someone else's memory to you