Hi, i am new to Unreal Engine. I have an issue with my materials. When i apply it to an object, it works as i want it to on some sides, but the others it creates strange vertical lines. I was wondering if anyone knows how to fix this?

It’s UV stretching. I’m assuming you’ve just scaled a cube?

You can fix the UVs in the engine modelling tools, but you need to copy cube first ( in the asset browser ).