Coregistration: not overlapping areas

Hello,
I’m trying to coregister two images relevant to
S1A_IW_SLC__1SDV_20180108T165715_20180108T165742_020066_022322_6EFC.SAFE
S1A_IW_SLC__1SDV_20181222T165722_20181222T165749_025141_02C6C5_F283.SAFE
i have executed all the step described in the tutorial HAZA03_Land-Subsidence_Mexico-city.pdf as reference considering VV band IW3 burst and 1 to 4 burst.
I’m not sure the results of the coregistration is ok.
Here attached the picture result of coregistration where i think to see not overlapping areas.
Furthermore attached the final result.
Thank you for your suggstions.