Why am I getting dark blurred spots?

[CoralNico]

Hello!

I created this orthomosaic and as you can see there are a lot of dark blurred spots. These were taken using 2 nikon d7500s set at 24mm and swimming about 1 meter off of the floor. Each camera took about 1400 photos.

https://drive.google.com/file/d/1zpMY7QOoB7xgnj7S6AoiodvzTSrwa3AU/view?usp=sharing

When looking at the photos there are a good amount of very dark low light photos so I am assuming that I was just two zoomed in for the height I was at and not enough light went in but wanted to get your thoughts and opinions in case there is a setting that I am simply not checking (or should leave unchecked) when creating the orthomosaic.

Thanks for any help!

Edit: Added Screenshots in case you do not want to download the whole file
Overview: https://drive.google.com/file/d/1xvDcAPqeypgTf7fKElZX8ks1LRibqEzh/view?usp=sharing
Zoomed in: https://drive.google.com/file/d/15YvzevQdXSz5QQW4Z87077ako-qBiJZ3/view?usp=sharing