Are these strips available in the original image? After the step of deburst, did you notice any of them?
Did you apply ESD Step?
Did you follow these steps,
1- Split, Select where is your AOI in which subswath IW1-IW2-IW3,
2- Apply orbit,
3- Back geocoding
4- Apply ESD
5- Create an Interfogram
6- Deburst
7- Goldenstein Phase Filtering
8- Multilooking
9- Phase Unwrapping by selecting (TOPO In case of DEM creation Or DEFO in case of Displacement Interferogram creation) mode and and MCF, in the step of the SNAPHU EXPORT
10- Phase to elevation (In DEM case) Or (Phase to Displacement)
11- Range doppler terrain correction.