Style layed does not appear in Map Viewer

[AymanUsama]

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I am using the ArcGIS online map. When I choose the field to pick a style with unique symbols, the style appears only in the Classic Map Viewer and is not displayed in the Map Viewer. When I change transparency, it appears that I changed it, and when I change outlines, it appears, but the colour and style don't appear. I want to solve this problem, and style appears in MAP VIEWER.

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[AymanUsama]

Is there anyone can solve this ? 

[RussRoberts]

Can you share the layer and web map and I can take a look. 

[ShaneONeill_144]

Where is the data coming from? Is this your own data or data you've taken from ArcGIS Online?

It would be great it you could share the web map/layer with us so we can review it.