Post processing units change

Hello,

I have selected base units metric, units for the file are mm & kg (same appears in the input file"STAAD Editor").

When i go to postprocessing mode after analysis, I find units for the moments kN-m and force kg.

I changed them from "change graphical display unit" tab, to kg-m.

Now the units appear consistent i.e., kg-m & kg.

But whenever i make changes in the input file through "STAAD Editor", and go to post processing mode, again the units change to kN-m & kg.

What could be the problem?

I am using STAAD Pro V8i, 20.07.11.90