View Apple Health data sources used to calculate step total

View your data sources

Here's how to see which devices and apps update specific health categories:

1. Open the Health app and tap the Browse tab. 
2. Tap a category, like Activity. If you don't see the category, swipe down to reveal the search bar, then enter a category.
3. Tap a subcategory, like Steps.
4. Scroll down, then tap Data Sources & Access. Only the sources that contribute to that data type will appear. 

Source: https://support.apple.com/en-us/HT204351