Flickering when shooting a 3D print timelapse, even when all settings are manual (as far as i can tell)

Hello all, I have been making some 3D printing timelapses for fun but I ran into the issue where i can have very noticable flickering between layer shots. (For those who don't know what 3D printing timelapses are, when you 3D print an object the machine places a layer, for every layer you take a picture and then stich them together). It is really driving me crazy because I have no idea whats causing it. I thought it might have been my soft boxes or some light from outside thats bleeding inside (the room is not 100% free from daylight) but when i did the same print twice the flickering started happening on almost the exact same frames. This is my current setup:

- Nikon D7100, fully manual (M mode)

- Shutter 1/50 (I'm in Belgium)

- ISO 250 fixed, Auto ISO OFF

- WB locked at 5560K

- Bresser BR-225-B LED daylight set

Im going to let Claude word the problem more specific in clear terms since i wanna explain it as clear as possible, I hope this doesnt go against rule 11. "The flicker shows up as subtle brightness/color shifts between frames — warmer/more orange on some frames, cooler on others. It gets more noticeable toward the end of the print as the object gets taller."

I will also link an IMGUR with 2 frames if you open both of them in a new tab and switch between tabs you can really see what im talking about.

I hope someone could help me out, I would really appreciate it.