Using ArcGIS 10.5.1 on WIN7. I have a waterline shapefile with a size attribute. Using symbology, unique value to divide the 10" and larger to be one color and everything below another color. I used a color ramp then changed the properties to reflect color choice. The colors are correct in the TOC but not reflected correctly in the map. Many lines smaller than 10" are the wrong color. Tried to select by attribute and got the same results. Does anyone have a suggestion as to what's wrong and how to solve?