Am I even working in the right Chatgpt?

I have two chats, they’re both working on the same text. Chapters of an already written book. The AI can’t remember from chat to chat. Why? I worked on text in a new chat. Went back to the chat setup for the book and chapters, and it didn’t even detect that the text I gave it, was it’s own. And it started to refine it again. How is this possible?