Dear Bentley,
I run the same file in two different Staad versions i.e. 20.07.11.90 and 20.07.11.33. To my big surprise, the output and results were totally different. There was a stark contrast in the values.
I attach herewith the Staad file I used to run the above (https://1drv.ms/u/s!ArsEOlfodDY2mGheL_fYJAlDxcHN).
Kindly enlighten why is this happening, and does this also mean that either one of the Staad version will perform an under / over design? Thanks.