Em...I still reckon it happened on CD16....Forget FF...I don't think she's being your friend! Only because of the temp dip before the rise......but hey....I'm no expert
It makes it a bit harder when you don't have a 2 decimal place thermometer....like your temp could have gone up a fraction today, but your thermo wouldn't show it....IYKWIM ..... that's why it's flat lining