Dark Brown CMYK

[digitalphaser]

I encountered a strange problem. Extreme difference dark brown colors in Xara (Simulate Print Colours) and in the exported PDF/X file (Fogra 39). This problem is not visible in the light tints of brown. Has anyone any ideas. Why and what to do?
Usually, by offset printing colors are a bit saturated than in the original file. But there is an amazing difference.
Some of the CMYK values I took from the DuMont Color Atlas. But the result is the same.
In PDF file are the colors that I would like to have.