I have seen this issue before, yet i have no idea how to solve it?

The model build from other prefabs. There is a start piece, a middle and an end piece. They share the same material. For some reason there is these edges where the model connects, and the color is off abit.

Anyone who has an idea how to what causes this and how to solve it ?

Figured it out, the front and end piece were missing a face, which was causing the issue it seems.