Excessive Emails from Agile Boards

We have set up an agile board to display a subset of issues successfully.  When someone subscribes to the saved search associated with this agile board, the email notifications they receive often pertain to issues not on the board.  Is there a way to prevent this?

The footer of the message says the email was sent because they subscribed to the board in question.  We are using 6.5 currently, but upgrading to current in a few days.

Thanks

Dan