Rescaling goes wrong?

Hey folks,

I'm facing a weird problem in Unity. And I'm not sure what I'm doing wrong actually. I have an edge that I rescale based on the two points it should connect. Now my code actually works, but my problem is, that the gameobject becomes a big box instead being a thin rectangle (like an edge should be). Basicly, it scales trough the y-coordinate too, which I'm obviously not doing.

 //the scaling
 this.EdgeTrans.localScale = new Vector3(edgeVec.magnitude, 1, 1);
 
 
  //how my object is transformed
 this.EdgeScale(this.EdgeVec);
 this.EdgeRotation(this.EdgeVec);
 Vector3 edgeTrans = this.StartVec + (this.EdgeVec / 2);
 this.EdgeTrans.position = edgeTrans;

I really dont know, why my gameobject would scale its y-coordinate too. I'm kinda confused. Am I overlooking something? I would appreciate any help, since I'm pretty new to Unity.

Regards,

IbrahimK.