I have noticed that when I try to edit Activity settings for my Forerunner 965 in Garmin Connect (v4.70), they wrong activity is openned based on the default order, and not the order as customised and displayed in the app..
How to replicate:
Click on Forerunner icon -> "Activities & Apps"
In my case I had changed the order of favourite activities to: "Walk, Bike, Navigate, etc..."
When I click on the "Bike", the 2nd item in my list, it opens the edit screen for "Run" which presumably was the 2nd item in the default list before I customised it.
All other list items show the same behaviour, eg clicking on "Navigate", my 3rd list item, opens the "Bike" activity...