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[SOLVED] Significant discrepancy between ADS and Momentum simulations

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I designed a simple 90 degree branchline coupler in ADS, tuned it to my liking (my values were very close to theoretical). Now, I simulate the structure in Momentum and my curves are all off, I get 3 dB less since it got shifted by several GHz.
Any suggestion and ideas why might my results be so different (and which one to trust)?

https://imgur.com/a/1cIr8

https://imgur.com/a/1BDYJ

https://imgur.com/a/pMq19
 

Schematic and Momentum simulation result may be different. If return loss is 3 db less then it's quite possible but insertion loss should be reduced such an extend .
 

Correction
insertion loss should not be reduced such an extent .
 

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