So i have been walking and running the same route along the river for 8 years now, always at the same pace for walking and for running. i had started the C25K last May and after graduation i continued to run a little further every couple of weeks and reached 11k and then stepped back to a very regular 8k three times a week. i did 32 of them and each time my pace was average 8.30 per kilometre, i ran to a set point every time and turned, it was at 4k, it would take around 1 hour and 10 minutes and then all of a sudden it all changed, i haven't changed my running pace, i'm slow but a steady slow, it then showed my pace at an average 10.30 per kilometre and the distance was now 6.6k even though i have run and walked the same route. i bought a new fitbit versa 4 from a charge 2 and still wrong. i've run a further 12 and all showing the new pace and distance and now when i run the pace can jump from 6.30, up to 12, back down to 9, its all over the place. today i walked the same route and it showed the distance at 8k while walking, help.
