Can't find group paragraph styles in Indesign paragraph styles panel

I received some Indesign file that does not show the paragraph style in the Paragraph Style Panel. It is listed at the top of the panel, but can not found among the other styles in the panel. I can right-click on the named item and edit it, but can't see the style in the panel. 

I have a handful of files with this issue, but most of my other Indesign files are just fine. So it is not an Indesign issue, just a document file issue. Any idea how I can resolve this?