GDI+ drawpath() and fillpath() overlaps when transparency is assigned

Question

the border and contents overlaps when drawpath() and fillpath() are both called and transparency is assigned. the problem is not neglectible when strokewidth is large. there is a third color on the overlapped part. The problem occurs when printing to pdf via microsoft print to pdf. Althought a third party pdf creator can be used to avoid the prolbem, I still want the problem solved when printing via microsoft print to pdf. Is there even a way to dig into pdf creation process of ms to pdf? thanks in advance.