Dear,
Did you run the report IW38 with basic start and basic finish dates of the orders and then in MCI8 use same date range for your analysis.
MCI8 runs on LIS structures, hope we don`t get such problems normally.
If still having problem with it better look for notes mentioned by our friend Caetano Almeida.
SAP Notes :
1) 180047
2) 112841
Regards,
pardhu