No filters in sub-folder

I don't know if this is since updating Bridge (15.0.0.397), but I have a curious issue.

I have a folder with my RAW files from a shoot. The filter panel shows the usual assortment of filters. 

I moved some of the files to a sub-folder. When I view that folder, the filters tab is definitely lacking a few of the filter options.

Is there a setting somewhere that I need to check? 
Hmm... All of the files in the sub-folder have the same exposure settings. Does Bridge now only show filters if there are parameters that are different between files?