Unity URP lighting causing different colors on each object

Hello,

Since this week a weird issue has appeared. In Unity URP, some objects have a different color caused by scene lighting. The thing is, the scene in the screenshots worked for over a year. I haven’t changed anything. It’s happening in my custom shader as well as the standard URP Lit shader (see screenshots).

The ground is build out of 5x5 tiles. And the rest of my world design is modular like this. Also, I’m not baking any lighting. It’s all realtime. I know this can cause issues when having too many lights. But I constructed my scenes with exact amounts of lighting. Tested it all thoroughly. Lowering the Additional Lights - Per Object limit doesn’t work.

Does anyone know what causes this and how to solve it?

Thanks!

Maybe the vertex normals in your model are bad. Otherwise check your not using compression on the mesh import settings.