Suppose [Graphic]->color specials: -cmode: is auto mode(p2) which is the default setting(cf.Q_P7). Preview again by change it temporarily to patch2.
The above patch2 means to preview under the same way in printing. If this preview is correct and the printing is wrong, then it is almost sure that the problem exists in the Windows printer driver(or its setting) or the printer.
If there exists a problem in the Windows printer driver, then try the setting auto mode(rep). In some cases, this resolves the problem (cf.Known Problems).
In the above, the preview and the printing should be tested under the same values of parameters (resolution etc.). If the paper size or the resolution is not correct, a warning will appear before the printing.