Seems that if you are forced to unpair your watch and repair it. Duplicate devices are created with the older data having priority over new data with recording date like for exercise to health. Specifically cardio fitness.
Shouldn't restore data merge data?
Apple Watch Series 5
Hey there OneWalk,
Thanks for reaching out to the Apple Support Communities. To get started, are you able to change the priority of the data sources to have the correct device listed at top using the steps listed in this link here: Manage Health data on your iPhone, iPod touch, or Apple Watch - Apple Support
Prioritize data sources
Here's how to choose the sources that Health uses first:
1. Open the Health app, then tap the Browse tab.
2. Tap a category, then tap a subcategory.
3. Scroll down, then tap Data Sources & Access.
4. Tap Edit.
5. Touch and hold the Change Order buttonnext to a data source, then drag it up or down in the list.
6. To turn off a data source so that it doesn't contribute any more data for that category, tap the checkmark next to the source.
7. Tap Done.
If multiple sources contribute the same data type, then the data source at the top will take priority over other sources. Any new apps or devices that you add go to the top of the list automatically, above your iPhone or iPod touch.
As for why the Apple Watch is showing as a duplicate data source after unpairing and setting the device back up, we would recommend reaching out to Apple Support directly from this link here: Get Support - Apple
Take care!
Duplicate Apple Watch in the Sources devices list
