Problem with saving

Hello. I imported a rtf manuscript, like always, into scrivener. No problems. I fixed and arranged 3 chapters, then I went and did the About Author page. After I did that, the three chapters were blank! all of a sudden. Everything I’d copied, pasted, and formatting just… disappeared. I had to redo them again, and had no problems, but I’m sure I’d saved it. This scares me because I’m afraid of that happening while I’m writing. I don’t know what could have went wrong.

By the way, all three chapters, 1, 2 and 3, were actually still there that whole time in the binder. Everything in them was gone.