If you shoot in RAW, micro 4/3rd cameras like the GX1 will add lens profile information to the images so that software like Lightroom can correct vignetting and other lens aberrations automatically.
Also it's good to overlap each frame by about 1/3; you really want to avoid stitching the edges of the frame if you can.
Also important to make sure the camera is set to Manual and aperture (as well as exposure time) is consistent across all frames (maybe you did this - just going on Michael's remarks).
If you did have the aperture on Manual and it still shot inconsistently, try closing the aperture down 1 stop and trying the whole set again. The image will be slightly darker but you should reduce the exposure difference.
Great location / capture. Well worth setting up again if you get the chance!
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