In my release overview, I was trying to show my "parking lot" items. I found after talking with a Aha! rep that since the parking lot items aren't part of the release they have no container in which to display and that filters throughout the site reflect all available data points, but aren't necessarily applicable to all views. This is confusing for the user. If a filter doesn't work on a particular view- it makes more sense intuitively to filter from that view.