S2P data from HFSS to ADS mismatch

I have created an s2p file from HFSS15 using solution renormalize to 50ohm. The header of the s2p is " # GHZ S DB R 50.000000". I have created a ckt in ads with 2 port s-parameter block connected to 50ohm terminations on both ends to plot/ensure the s-parameter in ADS 2009. When I plot db of s(1,1) in ads, it doesn't match with the values in the s2p file. What could be the problem?

could you paste your SCH?

It was a mistake, that I was using different points to plot the data and the narrow band got missed in the process...Once the same points were used to plot, data matched.