This has been happening for the past many versions, and needs to stop, please.
Any time you choose from the Select Users dropdown (e.g. changing a filter to display only selected users) the First User is always automatically selected. Does this really need to happen?
For a while now we have been creating a user called "Aaadmin" so that it will also fall first, and not mess up task lists and other items where the first user should not be selected, but often is unless unchecked.