REFS, lost hard disk space after Windows defragmentation

Hi,
first some short information about the Server.
Windows Server 2012 Datacenter
OS disk = 60 GB SSD
Physical raid Controller: Areca ARC-1261
Raid = Level 6
Used Disks = 11 x 2TB + 1 hot spare
File system = REFS
Usable space = 16,3 TB
Real used space (what the tools and folder properties counted) = 14,0 TB
Used space (what i see in the computer overview) = 15,4 TB
Unknown space what I could see with disk scan tool (or the tools calculated) = 1,4 TB
So here what you could quickly see that i've got a "little" problem with wasted/unknown space....
How the Problem originated:
The system drive is a SSD, after running this Server about 150 days and unnecessary little Windows problems i remembered the garbage collector for SSD (TRIM).
So i wanted to schedule with "Defragment and Optimize Drives" an automatic job for cleaning the drive.
My problem was, that I couldn't deselect the big raid volume, but i gave it a try an scheduled weekly the optimization.
Next day i got some alerts "low disk space warnings", i've lost about 1 TB of disk space but could not explain how I could lost this amount of space.
After starting a resizing of the raid, i counted with file property the real used space and could not explain the shown size in the overview.
What I've tried to fix this problem:
First of all, a lot of google....
Shadow copy: checked, fully cleaned, disabled = nothing just a few GB.
Backup: checked, fully cleaned, disabled = nothing, but ran under an extra disk but... could never know what's wrong
Folder options: enabled this far that i could see system protected files and default hidden
Safe boot = tried a safe boot (some solutions for different user in the web) = nothing could not see more or less
O & O Defrag (latest server edition) = didn't support REFS
last of it, new clean installation of windows
My Questions:
Is defragmentation on refs possible/useful or is it just an bug with that "Defragment and Optimize Drives" tool?
Are the any information's about fixing troubles on REFS or commands on PS oder cmd? (could not find anything on google)
I've got some books for WS2012 and e-books but there are no helpful information's about REFS.
I know this is a big text block, but i wanted to show you detailed the problem and my attempts to solve this problem.
I hope you could help me or show me new ways to solve this problem.
Tanks in future....!

ReFS formats by default to 64KB block sizes (shows up in Disk Management as "Allocation Unit Size" when you go try formatting).
NTFS formats by default to 4 KB block sizes and up to 64KB.
If you have 1 file that is 4KB in size, and you use ReFS (default block size), it's going to occupy the entire 64KB. That is true of NTFS if you choose to format in 64KB (required for SQL and Hyper-V VHD's and VHDX's).
If your files are smaller than 64K, then stick with NTFS.
Yong Rhee [MSFT]
That is true for the defaults for ReFS but its possible to use a smaller allocation size using the options. Unfortunately most never think to do that.
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