This is the first velocity image after the completion of Inversion: First step of PS Interferometric stacking. It appears that the grid like pattern https://ibb.co/3W2CwLh is similar to the unwrapping error patterns but in the tutorials and help. phase unwrapping wasn't mentioned to be performed during this step. Also, why in the metadata, the description says that the products in the first inversion folder are of reference acquisition (the single master) and secondary acquisition (only the first date in the time series instead of all the input dates)
https://ibb.co/6Xw6X3h