Sometimes you may notice that the gray capacity bar for a resource is smaller than for other resources, even though they have the same schedule.
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This occurs because there is a card planned either in the past or in the future that exceeds the capacity of the resource. As a result, the gray mound is scaled back to visually represent the difference or ratio.
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In this case, it's best to check what is planned for this resource and see if there is a high peak in capacity. Adjusting this will return the capacity bar to its normal display.