Strange colour casts

Hi there,
I’m wondering if people can help me identify the cause of this colour cast.
I am using a Fuji XT-2 with macro lens, essential film holder and Raleno light with 95+ CRI at 5600K.
I mask off the stray light and shoot in pitch black so I am unsure of what could have caused this.

The negatives themselves look fine, not bent but they were not developed by my go to lab and don’t look as high quality development.
The images attached are nlp straight conversions at saturation 4 and frontier model, with auto-neutral
They were taken on a foggy day.

I think it could be in your film’s emulsion. I would just convert them into a black and white version style of your choice, and not worry about color.