Yesterday, I noticed that my iPhone 8 Plus has been counting 'Flights Climbed' for stairs that I have gone up. Here is a pic of my daa for 'Flights Climbed': As you can clearly see, my phone has been counting my flights climbed, between 31 March 2018 and 16th April 2018. This makes zero sense though...???? Why has it ONLY been counting this since March 31st 2018?? Looking at the actual data for the individual days (from 9th April onwards), it shows that I have climbed flights at around 18:00 to 18:10 every day. I know where this is counting because at around this time every day, I am walking home from work and at this time, I am actually walking up a very steep pathway, whereby the phone is thinking I am climbing stairs (even though I am not). This is fine as I know how the data is being collected. However, what I don't understand is why my phone has ONLY been counting these 'flights' since 31 March 2018 and why is there a massive gap between 16 June 2017 and 31 March 2018 even though I make the same journey every day (up the steep pathway) and always have my iPhone 8 Plus (which I have had since launch) and my S0 Apple Watch (which doesn't count flights climbed anyway)??