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After computing a model, the calculated demand is different than the entered fixed demand. For example for a steady state, the total demand shown in the Calculation Summary does not match the sum of the demands in the Demand Control Center.
1) This could be due to a Demand Adjustment which manipulates the demand in a certain "Scope" (or a selection set). You can check that under Analysis > Calculation Options. Find the option "Demand Adjustments" or "Unit Demand Adjustments" and see if either of these is active. If so, that might be causing the difference in report demand.
2) Check if demands are applied to inactive elements. If you are counting the total demand as seen in the demand control center, some of the nodes may be inactive ("is active" attribute set to "false") which means they will not be considered in the calculations. Try creating a query with Is active = true, select those elements, then filter on selection in the demand control center before adding them up and comparing to your calculation summary. If this is the problem and you used LoadBuilder and wanted to assign the demands only to active elements, re-run Loadbuilder with a selection set of only active elements.
How to edit demands, unit demands, or a subset of demands globally