AutoCAD 2004 - Plot Style Problem

We recently received drawings (with the companies plot style .ctb) file. When we use ther plot style to plot the drawings, the plot appear too screened. The also sent us an orginal so we can sew what it it suppose to look like. When we use our plot style, the lineweights aren't correct. They look correct in the print preview, but aren't correct when we plot them out. Any ideas on what they might have done to their file to make their plots look this way?

 

Check to see if your pc3 file for your plotter is set up to grayscale
colors, and make sure that you have the ctb file in the correct location, it
should be C:\Documents and Settings\YOURPROFILENAMEHERE\Application
Data\Autodesk\Autodesk Land Desktop 2004\R16.0\enu\Plot Styles.

When we use ther plot style to plot the drawings, the plot appear too
screened. The also sent us an orginal so we can sew what it it suppose to
look like. When we use our plot style, the lineweights aren't correct.
They look correct in the print preview, but aren't correct when we plot them
out. Any ideas on what they might have done to their file to make their
plots look this way?