Does not calculate the amount in the table correctly
probably you use some aggregation on this field and that's why it is 0, try different aggregation. Hardly to comment as can't see the metric configuration, so just blind guess...
I have had this same problem recently. When I have the totals displayed on the report, the total does not match the values in the table when I add them manually. In the screen shot the calculator shows the values from the table added manually, which equals 2 less than the automatic total on the table.
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