Invoke-IcingaCheckMemory output in percentage

Dear Icinga Community

I use the Icinga Powershellframework v1.9.2. on Windows Server 2016.
When i use the Invoke-IcingaCheckMemory Command it returns the values in an absolute Scale not in percentage:

Invoke-IcingaCheckMemory -WarningPercent 30 -CriticalPercent 50
[OK] Memory Usage
| 'used_memory'=7507121000B;;;0;8588902000 'pagefile_cpagefilesys'=716000000B;;;0;2642000000
0

What I’m doing wrong?

Thank you
Burkhard