Score display 0 and 10 on the same space

The display bug is like this Screenshot by Lightshot

 void Update ()
 {
     score.text = "Score: " + GameController.data.score.ToString("D5"); //force timervariable to be an integer
 }

The problem was due to Viewport Rect in the Main Camera being unproportional. The ratio of W:H must always be 1:1