Used and Free space backwards

Good Day;

I just downloaded and ran defraggler and I noticed an anomaly between the used and freespace headings.

It seems to me that they are reversed, for example my E: which I know to be almost full lists as 2% used and 98% free.

Why is that?

Also when I ran defraggler on my C: in the properties pane the used space which is blue increased while the free space in white decreased.

To my understanding that is opposite, the used space should decrease and the free space increase.

Is that correct?

I am confused and need your help to understand why the used and free space headings seem to be backwards.

I look forward to your reply.

Thank you

Also when I ran defraggler on my C: in the properties pane the used space which is blue increased while the free space in white decreased.

To my understanding that is opposite, the used space should decrease and the free space increase.

I have that same problem too.

while the application is running, it moves the data by creating duplicates on the hdd. after finishing it removes the duplicates again. the free space before and at the end should the same: you don't win any space by defragging!