Hope you are doing great. As for the map exposure/contrasts variability, we do equalize the exposure/white balance between all the cameras during the stitching process. That being said, performing that post-processing that you are doing on your end could be inducing exposure differences between the images. We do try to correct those exposure differences and that could cause the variability that you are seeing between the uploaded images and the final processed map.
You could try testing uploading the original images without the post-processing that you are doing and create another one with the edited images and compare results.
I hope this information is helpful.