carolinacuts,
What you are seeing is color-banding in a peach like color. Will also happen in sky blue, teal and light tans, etc.
EK Print is the cause, not the printer.
When trying to produce lighter pastel range colors, run sample tests first and make a few adjustments in EK to the Ink Settings section: try moving Contrast to a -1 or -2 and bump up the brightness to a +5 or +10.
Make adjustments in small simple increments as this will be easier to see how to "dial-in" the color you are trying to produce.
GL
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