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In some instances, a feature class that has data with categorical symbology loses the value field label when published to ArcGIS Online.
For example, in ArcMap, a feature class is symbolized based on a numeric field for the magnitude of earthquakes. The field name used for the symbology is 'Mtude', but it is changed to appear as 'Magnitude' in the Table Of Contents for legend purposes. When publishing the feature class to ArcGIS Online, the value field label reverts back to 'Mtude'.
This is a known issue. Please refer to the following defect, BUG-000091082.
To change the value field label in ArcGIS Online, go to the Admin Directory for the layer or feature service. The instructions provided describe how to change the label of the value field for the symbology of a hosted feature service in the ArcGIS REST Administrator Directory page.
It is recommended to change the sharing permissions so that the feature service is not shared with anyone before editing the service definition.