Ciao ​@J_Free. What's the correct activity? Are you sure of it?

The first photo which is my phone, yes.

That could be many reasons. Like Vincenzo I wouldn’t be so sure that the old distance is the correct one. And for the elevation it could be that Strava doesn’t know the new watch model and replaced the recorded elevation with imprecise data from their maps. I would try opening the activity on the Strava website and look if the “Correct Distance” and “Correct Elevation” options are there (the latter can be on the app too). That’s an indication if Strava has used the data from the watch or their own data based on GPS.

I'll check the Strava website as you suggested. I've been using this phone for a few years now and the stats always match everybody else in my group rides. Of course not exactly but within reason, this watch is always quite different.

I checked the website and there was an elevation adjustment option that was only available for activities with my new watch, I clicked that and nothing changed on any activities.

I want to throw this out here as a theory, and you can let me have it if you disagree:

I think the system is behaving as expected.  If the watch has a barometric altimeter, Strava uses that data to provide elevation.  For activities recorded via the mobile app (i.e. your phone) Strava uses it's own series of maps with topographic data to provide that elevation data.  (Whether the phone has a barometer or not.) More details:  https://support.strava.com/hc/en-us/articles/216919447-Elevation 

 
From personal experience with Garmin and Wahoo computers, I can tell you there can be a big difference in these results.  Also, you might have to factor in changes in barometric pressure at your location during your bike ride, as this makes the computer think your climbing or descending when you're not.

Whaddya think?

Did you update the browser tab with the activity? The change often does not appear immediately.

Seems like a possibility-It surprised me that it was so different than my previous device and from others on the rides. 

I did and didn’t see a change, but going back today I do and it seems more reasonable.