Differential backup problem

Running BE 2012 on Windows 2008 server.

Just did a restore of a complete backup and now I want to do the differential.  Chose my last differential and it says 10.5 gb were backed up. 

Choose restore, files folders or volumes, file and folder backups,

I Resource view find the date and time of the backup I want to restore

Here is where it gets strange.    It shows ALL my folders and subfolders and all are unchecked.  It won't let me proceed until I check something to restore.  Shouldn't it only have what's been backed up since the last full and not everything??  How do I know what to choose?