HELLO FERAS..
I am not aware of your problem but definitely i want to help.. I can see there is almost 24 dbm power level difference between the two..
Firstly i would suggest you to use power meter if you can and then go for comparison with the two cases and see which is much closer in that case..
Secondly try increasing global layout iterations and then keep on changing the signal index while visualizing the spectrum or power in each case.. I hope it will help.
Thanks & regards