Windows not showing correct size of folder

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Joined
10 Jan 2011
Posts
62
Location
London
Got a bit of a problem with my work machine. Windows is not showing the correct size of folders.

I've recently backed up some data, around 200gb, but if I right click on the backup folder and click properties, it says only 792mb.
If I use Treesize, it shows the correct size. If I move the data onto another hard drive then view it on a different PC, it shows the correct size.

Any idea what could be causing this?
The program I'm using to move the data about is Roadkil's Unstoppable Copier, but I've never had this problem in all the years of using it.
 
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