I vaguely remember posting something about this on this forum a few years ago but I can't remember the outcome.
It appears that a featureLayer will fail to draw if its symbology is normalized in ArcMap. To reproduce, add a polygon layer to ArcMap and set up a Graduated Color symbology, and Normalize with the Percent Of Total option chosen. Publish this to ArcGIS Server.
This service will draw correctly as a dynamic layer, but not as a feature layer.
A workaround is to manually calculate a new "normalize" field in ArcMap and symbolise based on that. Is there any chance this could be fixed so that the feature layer correctly uses the normalized symbology?
Thanks,
Steve