Unity Color Problems

Hello,

I just want to understand the Color of Textures in Unity. I dont have a Volume its just the Materials. I have a Picture wich shows, that the Color of My Texture gets unconsistent manipulated in Unity:

Im the type of person who makes a texture and then i want that texture to be what it suppoosed to be. Unity changes it, thats not that big of a problem if it would be consistent and the same changes every time. Now i have a Texture whats different every time and i cant work with that.