Many unknown devices on the Health app

If you restore your iPhone, or switch to a new iPhone without disabling Health data in iCloud on your old device first, you will see "duplicates" of your previous setups or iPhones, with Health Data. So it's actually your own iPhone or iPhones from which you can see the Health Data, so you don't have to worry.

I've restored iPhones countless times, and I've learned that if I don't disable Health in iCloud first, there's a duplicate after I set up my iPhone again. If you don't want to see the long list of iPhones, then you can simply delete them one by one.

EDIT: Duplicate is the wrong word for this. The data you see is Health Data stored in iCloud from previous iPhones, or setups on your current iPhone. Hehe tell me if it doesn't make sense 😅

If you suspect that others have access to your Apple ID, see this article:

If you think your Apple ID has been compromised - Apple Support

I was just told by support to turn off icloud off and on because rings weren't updating. I now have 3 of my phones on the list of devices. The original one with all the data since getting the watch and more, the other 2 devices only have data from today's turning icloud off and on. After restarting the watch all previous data and awards seem to be correct, do I just leave all devices as is. Will it just continue to write the new data on the "new" devices but will it all be synced anyway?