The lines weights are incorrect in print / preview when using a MicroStation Pen Table to change the line weight.
Steps to Accomplish
The problem can be solved be changing the “Element symbology comparison mode” to “As displayed in view”.
To correct the problem:
MicroStation Pen Table is attached in the Print dialog box.
Go to -> Resymbolization -> Edit Pen Table -> Global Actions -> Pen Table Options ... -> "Element symbology comparison mode” change to As displayed in view