I need help with Blood sugar/ Ketons for 9 day dry fast

I have done two nine-day dry fasts and the blood sugar versus ketones seems fine up until day seven.

But for the last two days, they reverse and the blood sugar rises to my normal every day blood sugar and ketones start to fall. This worries me as I don’t know why this is happening. I’m concerned that I may have run out of fat to burn. I’ve attached a picture showing the ketones and blood sugar. If anyone can shed some light on why this is happening I would like to know.