Data deduplication works vice versa

Hello. I have enabled data deduplication on one of my SSD's volumes and then run Start-DedupJob cmdlet with optimizastion parameter on this volume. After dedup completed i check Get-Dedupstatus and get this output:
FreeSpace    SavedSpace   OptimizedFiles     InPolicyFiles      Volume
81.25 GB     9.44 GB      2                  11                 D:
Howevere when i have checked disk space, i discovered that free space was not increased, but instead decreased. (I had 88Gb of free space before deduplication, and after i had 81.25Gb of free space). Also I have checked the only folder in this volume and
found it has the same size as before dedup.
Also i tried Start-dedupJob with GarbageCollection type after all, and now i have that output:
FreeSpace    SavedSpace   OptimizedFiles     InPolicyFiles      Volume
81.26 GB     0 B          2                  11                 D:
Why data deduplication worked so strange for me? 

Hi,
For the total used space when you right click on your volume and choose Properties, it is not accurate as for those folders your current account do not have permission to access, they will not be counted.
For your current situation, you can test to first disable deduplication, run a check disk in CMD for used disk space, and enable deduplication again, when it finished, check the chkdsk result in CMD again to see if same thing still happens. 
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