The problem is that the favorite buttons are reversed: people already marked as favorites show the ‘Favorite’ button, while those who aren’t show ‘Unfavorite’.
Problem with the Find my app in the iOS Beta 2
You should probably raise this as a bug in the usual way. It won't really get progressed if it's only posted in these Developer Forums.
You need to raise each issue you find separately at https://feedbackassistant.apple.com/ You can post the FB numbers here if you want, so that others can link to them.