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HMC547ALC3 Mismatch with Datasheet Results

I am using SPDT switch HMC547ALC3 for X-band. While testing, it was observed that when RFC to output RF1 path was ON, not only the insertion loss was poor but it was mismatched. Similar behavior was observed in the case of RF2. Switch IC was also changed to be sure if the IC had issue. PCB layout was also verified in ADS and CST software to make sure about any issue with layout tracks. Short test was also performed. What can be the issue? 
I have attached measured S-parameters for 8-12 GHz (Insertion Loss and Return loss).


Query about HMC547ALC3 RF switch
[edited by: Yumna at 5:21 AM (GMT -5) on 24 Dec 2020]