I have a Fenix 5 and it keeps recalculating the steps on any day with an activity, so it happens a lot that around 9pm it tells me that I achieved the steps goal (10,000) and before midnight I see that I have done more than 10,500 and sometimes even 12,000 then the next day I find out after syncing with the app that it recalculated the steps and showing that I made 8,800 steps for example. This happens only when I track an activity, not sure why it just erase all the steps taken during the activity.
It's really annoying to spoil the steps goal streak after doing great efforts over few weeks just because of a silly bug in the software which I am still unable to understand the reason behind it!!