Physics.Linecast seems to be hitting itself

Hello,

I'm making a radar that is showing if two elements are visible from each other, and making a material change if so or not. I'm using a LayerMask on the object.

It works, but the raycast seems to be hitting on itself and makes the if statement shuffle quickly between true and false when the result is false (making the material flash)

Here are the console/debug lines that makes me think the raycast his hitting on itself.

First one is what makes me think the raycast his hitting itself (wich is probably not the case but I can't seem to find an answer to this line):

Blocked by UnityEngine.RaycastHit UnityEngine.Debug:Log(Object) radarScript:Update() (at Assets/script/radarScript.cs:42)

Seccond debug line shows up when the result from the if is false.(wich is correct)

Visible between 1 and Main Camera UnityEngine.Debug:Log(Object) radarScript:Update() (at Assets/script/radarScript.cs:46)

And my code:

 public Transform shooter;
 public Transform runner1;
 RaycastHit hit;    
 public LayerMask mask;
 public Material visibleMat;
 public Material invisibleMat;
 public GameObject visibleMarker;    
 
 
 mask = ~mask;
         
          if (Physics.Linecast(shooter.position, runner1.position,out hit, mask)) {
             Debug.Log("Blocked by "+hit);
             visibleMarker.renderer.material = invisibleMat;    
             
           }else{
             Debug.Log("Visible between " + runner1.name + " and " + shooter.name);
             visibleMarker.renderer.material = visibleMat;                
             }