CCleaner - Analyze / Post Cleaning Report

When I run CCleaner Analyze, I don't see any files in Recycle Bin and I double-checked with the bin as well. However when I run the cleaner, the post cleaning report shows that it cleaned 2.1GB of files. I tried several times and see the same gap / issue. My OS is Windows 8.1 Pro 64bit. I am attaching both Analyze and post cleaning screenshots here.

Anyone seen this before? Know why this is happening? Bug in CCleaner?

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Perhaps you have a corrupt recycle bin.

http://www.vistax64.com/tutorials/131294-recycle-bin-corrupted-cannot-delete-file-folder.html