I am creating this scene with hair in EEVEE - but the viewport and the render are completely different. I am using Bloom, turbulence force field. I can't seem to understand why this error occurs.
You are using a particle system with hair and interpolated children.
Interpolated children in particle childrens have a count property which is different for viewport and render.
If you want the same amount of children (and the same results) for display and render, choose the same value for Display Amount amd Render Amount.