Thank you so much Dr. Sassi! That was exactly the issue.
I have another somewhat unrelated question, but still pertaining to this scene file. Everything is incredibly slow for me, it takes about several seconds just to select a property in one of the Volume Builders, to the point where making changes in values difficult. I have a PC with pretty good specs, 2 GTX 3090s and 128 GB of memory, but my scene responds MUCH slower than the what I'm seeing in the tutorial I'm following.
I realize this could be a million different issues, but is there anything obvious I should check for better optimization? Thanks!