This is a known issue and the fix will be in the next patch. However since this is caused by a problem with the savegame, installing the patch won't fix your savegame. But we can fix your savegame manually if you send it to us.
Send a mail with your save to support@larian.com detailing which bossess/NPCs you're having problems with and we'll put them back where they belong. Sorry for the inconvenience, we're not happy with this situation either.
