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Hi Yuan,
Sorry for the delay getting back to you. It's difficult to say why you're not seeing quite the same results without a bit more information.
It shouldn't matter if the O&M costs are zero, so long as they've been properly included in your analysis, they should at least appear in your chart's legend. Perhaps you haven't properly selected all Area branches (by clicking Optimization Exercise at the top of the tree) when you display your results?
You can also load the completed optimization exercise into LEAP (comes standard with new installations) and compare it with your model, step by step.
Hope you find the problem,
Taylor