I've had the same one for a while now. It's been so long since I temped I guess I forgot how wacky they can be. I just looked at my old charts and it looks like they've always done that. I have 5 (yes 5...) different apps that I track in. lol. I had been using them to just track when my periods were while we were NTNP, but they all also have a function to track temps. I also do check cervix and CM, but they honestly can be completely off-the-wall also. I'm reading Taking Charge of Your Fertility now. I've had it out from the library for a month, but I've had this weird "semi-dyslexic" thing going on where I have been having trouble reading large amounts of text, but I was able to get through some of it last night.