a question about the port line definition

the structure is not a normal symmetry structure, in order to define one of the port line correctly, i first solve the port only. and get the result like the picture attached.

the question is how to defined right in the situation like this case. we can see the center line is not the right one in this case.
is there some way to make the filed displayed of the port solve more clear or in other words more lines in HSSS? the hfss version is 10.

thanks alot.

can anybody give a talk with this, or there are some problems of my question?