You may find when importing a dataset via Data Connect that numeric fields appear as null values within reporting, denoted by a - character
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Ensure that the field in your import dataset doesn't contain characters " encapsulating the value e.g. "9.91" should be listed as 9.91 within the dataset.
If this is the case update the dataset to remove the encapsulating characters as these should only be in place for values interpreted as strings, doubles require that no encapsulating characters be present.