Size of files deleted is smaller than shown by the analysis

I have the latest version of CCleaner Professional, and when I click analyze the size of the files to be deleted is always larger than that shown when I press the delete button. Also, when I run CCleaner on Windows 10 the items relating to Edge are skipped in the deletion process. (I have Windows 7 Professional on one SSD, with SP1 and all updates installed, and Windows 10 Professional Insider Build 14905 on another SSD). How do I resolve these problems?

Advice would be appreciated.

Thanks and regards,

Roy