Fountain Fill ISsues

Hello! I am new to using Corel Draw and I am trying to figure some stuff out.. what I'm trying to do is create a custom background fill.   

This is what I'm getting. in my custom fill settings I'm using black at the left, dark purple in the middle and purple at tthe right.

What i'm TRYING to get is something like this :

  

Any idea on why there would be such a discrepancy?  it's very frustrating. I tried switching my corel to the RGB instead CMYK colour settings but it wont let me switch it for some reason. Sigh... all I want is a pretty background without fading grey and dark rings of purple....

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