Regarding the activity feeds, I saw this with my own profile, too. What appears to be happening is the ZCA is carrying over any filtering from the main Activities feed into these other activity views which normally have their own context.
If my general Activities feed from the Home screen is not filtered — selecting “Feed” at the top instead of “Just Me” — then I see everyone’s activities when viewing the activities under my profile or the profile of others. If I go to the general activity feed and select “Just Me,” then the other activity lists under the profile views will show only that person’s activities. For my own profile, it then does show only my own stuff [Just Me]. For the profile of others, the filter seems to function as a ‘Just Them’ and shows only theirs.
And if you go back to the general Activities feed and set the filter to show everything, then the profile-specific activity views once again will show everyone’s rides instead of the Just Me/Them.
ZCA 3.72.3 , iOS 18.6
Ride on!