C# update code runs twice ?

Hello everyone,

i have an problem and can't figure out why it happens. When i run this code, the switch case prints me two numbers. The whole IF statement runs twice, but why? The manouverDone bool is only after the secoond run "false"... ( i figured that out with that debug line). I have also used a lock object for the bool, same result.

 void Update () {        
         if (maneuverDone){
             //Debug.Log("maneuverDone IF: "+maneuverDone);
             maneuverDone = false;
             nextManeuver = Random.Range(1,6);
 
             switch (nextManeuver ){
             case 5:
                 print ("5");
                 break;
             case 4:
                 print ("4");
                 break;
             case 3:
                 print ("3");
                 break;
             case 2:
                 print ("2");
                 break;
             case 1:
                 print ("1");
                 break;
             default:
                 print ("Error");
                 break;
             }
         }
     }