title: Some unkown effect is comming in my kivy app?
body: <p>Please See The image
  In this animation I have used lines and quad below lines.<br>
  I have added both(lines and quad) from one side(from right) and removed it from left side, also i have removed their color's from Instruction Group.<br>
  It is coming after I have added Image in background of the animation.
  And If I comment the code below it will not come.</p>
  <pre><code>self.img = Image(source = f'{random.randint(1,2)}.jpg', pos = (0, 0), size = Window.size, allow_stretch = True, keep_ratio = False)
          self.add_widget(self.img)
          self.img.bind(size = self.update_rect,)
  
  </code></pre>
  <p>Please see the code and help me.<br />
  <a href="https://i.stack.imgur.com/ILb8F.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ILb8F.png" alt="Unknown Effect" /></a></p>
  <p>Here is the complete code.<br>
  I really do not have any idea why its coming like this.<br>
  The effect is cool but its not in full that's the problem.<br>
  <a href="https://github.com/Abhay420000/2D-Path-GEN" rel="nofollow noreferrer">Code Link</a></p>