Empty space between subswaths after merge

tried finding a solution for this without any luck.

Either way, I’m trying to merge two subswaths, IW1 & 2. Problem is that the merged image has a huge empty space between them.
I’ve tried merging just the master image and that merges just fine.

These are images that have been coregistered through the snap2stamps scripts.

I placed a pin with the same coordinates in all three images to visualize where they should merge. As you can see both the first two images are overlapping and should merge fine.

IW2 → IW2

IW1 → IW1

Merged coreg →

Merged master (no coreg):

Cheers for any help