When you edit the stats of a workout, it changes the start time and duration of your workout. For example, I worked out earlier today, but I noticed I missed typing out one of the weights I used for an exercise. When I clicked “edit stats” I could enter the weight I missed, but after I saved it, it said I started my workout at 9pm (the time I edited the stat) and that my workout duration was 1 minute. It should say my workout was at 4pm and the duration was 1hr30min like it did before.