Yeah. Basically it seems that the project pages only show fixed IPs, the individual server pages show both and distinguish which are fixed and which are floating. I'd be interested in seeing floating IPs on the project pages actually.
Basically I think we should have a list of floating IPs reserved per project. These do not need to appear in the instances table - indeed some IPs may be reserved for the project but not associated with an instance (deployment-prep used to have several of these).