IE3D error due to the mergence of polygons?!

I am simulating one PIFA with IE3D. I use several shorting pins in stead of one shorting strip. And the shorting pins are modeled by conical vias with closed cap.
After inserting those shorting pins, the radiation patch was seperated to several parts. In such a situation, I can get reasonable results. However, if I merged those seperated polygons, the simulation results became ridiculous! I checked the connection, which seem Ok. Anyone encounter this problem, and can give me some explanations? Thx.

Please send the files to me and I will help you. Regards.

I have just emailed u the geo file and a brief report, sir. Hope for your reply and thx.