HI, I'm having the same problems using ArcGIS Pro. I imported a US census state level shapefile and then joined a table with numeric values based on State abbreviated codes (i.e. CA). ArcGIS recognizes this new field as Numeric in double format and can perform calculations on the field but the symbols in graduated colors and graduated symbols will not display. In contrast, the colors do display under the 'unique values', unclassed colors, and proportional symbols symbology types.
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