Additional:
Thinking about it... I'm also wondering why the bookmarks are appearing if the Custom Post Type isn't being recognised!?!
What's happening at the point of the filters? On the one hand, WordPress isn't seeing the "ba_sh" post type, but on the other hand, it is!
...EEEEEK!!??!?!!!
(Anyone else want to add to this? I lay down the gauntlet for any challengers to this issue..! :D )