CMYKreative on "[Plugin: WP Super Cache] It's caching (I think) but not showing any files to "purge/delete""

OK, been using this for a while on a few sites, but am confused about what happens when needing to purge/delete the cache.

For example, in cached content, it always shows zero files:
http://i58.tinypic.com/10ppl42.jpg

But in the sidebar it shows pages being cached:
http://i62.tinypic.com/2qlcvw8.jpg

So ultimately, deleting cache does nothing as far as I can tell.

https://wordpress.org/plugins/wp-super-cache/