Lumen meshes flashing

Hi all, I’m new to lighting and lumen with unreal and I’ve come across an issue where my lumen meshes flash all sorts of inconsistent colors and I’ve no idea how to fix this.

I’ve linked a video displaying what the issue looks like, a similar thing happens to all my meshes. I’ve removed all individual light sources one at a time from the scene and none remove the flash. In the video there is only a directional light and a sky light as lights in the scene.

WARNING - Very bright flashes, be careful watching if photosensitive.

Any help on what I need to do to fix this would be greatly appreciated.