ccleaner doesn't empty dustbin

Although ccleaner seems to work perfectly and the dustbin is empty after using ccleaner the program keeps listing that it cleaned 921220KB and 3.054 files. If I use ccleaner immediately after that the amount ccleaner says it cleand remains the same (see files). The amount of KB and Files is always the same.

What causes this fenomenon? Does it have any consequences?

OS: Windows 8.1 64bit.

I use Windows Defender, Windows Firewall and Trend Housecall, I regularly use Spybot, Adwarecleaner and Hitman pro.

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No consequences that I can imagine, try clearing your recycle bin manually (from the desktop) or from cleanmgr to see if that fixes it.