Watch activity data doesn't match on friend's Activity tracker

2 iPhones and 2 Apple Watches

With a friend and participating in a Competition on the Activity App in the Sharing tab.

The data doesn't match across both devices.

I've been using the friend's activity competition sharing thing. But after a workout, we noticed that our data doesn't match on each other's phones.

Like I would go for a walk and my phone would show 10,000 steps, but when I compared to the data on my friend's phone, it would show a different number?

You'd think when I click "done" on my work out and the message that gets sent to my friend saying I worked out the data I have on my phone would be the same that shows up on their phone in their activity summary page.

I feel like this might be more of a feedback issue, and QA needs to look into it more. But I was curious if anyone else has seen this and knows if there is a fix for it.

Why you might ask? Because I hate dirty data. The data should be the same, unless it was designed to share different results. Which doesn't make sense.

Thanks