HB analysis results with different SELECT options

hi

i am simulating a balun with its input/output matching network through HB analysis (using SNP file). While simulating I am getting two different values let’s say V1 and V2. Through SELECT options (" Terminal / Terminal and V- Reference Terminal / Instance with 2 terminals / Port (fixed R(port)) ") i got similar result (value V1) but using " Net (specify R) / Differential Nets (Specify R) " i am getting another same result (value V2). The value V2 is consistent with the time domain waveform simulated through HB analysis. Can anyone please guide me about the reason or mistake that I am possibly making.

Thanks