ANSYS simulation error

I am facing difficulty during report generation in ansys. While generating report, plotting frequency vs return loss, I get different result for different scaling. That is, my design frequency is 2 GHz. When I plot graph from the range (1-10 GHz) and (1-3 GHz), I get different results. For the range (1-10 GHz) I get -26 dB and for (1-3 GHz) I get -5.5 dB. Which result should I consider?
Since I get good result while plotting in the range (1-10) GHz, can I proceed with it?
It was a multiband antenna, so I analysed its performance in the range (1-10) GHz.

Hi suganthirs,

This suggests that your simulation is not adequately converged. Review your convergence criteria (most likely, delta S), and make it stricter. I usually do a minimum delta S of 0.01, with at least 2 converged passes.