Wrong total for sub categories

Hi DannyPhan - I suggest making adjustments to the prev_index logic and filtering to ensure it looks for the previous row based on your custom index logic. Please use the updated measure 

Test =
VAR current_index = MAX(version_code[index])
VAR prev_index = current_index - 1
VAR prev_ver = LOOKUPVALUE(version_code[ver], version_code[index], prev_index)
RETURN
CALCULATE(
SUM('Version'[NC_TT_TN]),
FILTER(
ALLEXCEPT('Version', 'Version'[MTC]),
'Version'[Ver] = prev_ver
)
)

Hope this works to display the expected output.