Does Application.CaptureScreenshot leak memory? (iOS)

I have created a simple application for iphone with one button from UI that executes just one line of code when I click on it. This is the code:

 public void CaptureScreenShot()
     {
 
         Application.CaptureScreenshot ("Screenshot.png");
 
     }

After I capture one screenshot, the memory increases by about 10 MB then drops only 7 MB

http://postimg.org/image/6r5tiaqjv/

When I take second screenshot, it goes up 7 MB, but doesn't drop at all, until I flip the device, and only then it goes to the starting amout of memory + 3 MB

http://postimg.org/image/am4m74kbv/

And then, if I want to take 2 screenshots in the row, it goes up like +25 MB of starting memory and drops 2 MB after a little period of time

http://postimg.org/image/5yyk5cwyz/

And even if I flip the device, it goes like 2 MB lower, but it is like +20 MB of the memory I use when I start the device. The point is, after taking at least one screenshot, I will never get the memory back. (The memory I had in the start)

Then I decided to try capture a screenshot manually with this code:

 public void TakeScreen()
     {
          // Timestamp returns the date, so each screenshot name would be unique
         string pngFile = Application.persistentDataPath+"/+Timestamp+".png";
         Texture2D texture = new Texture2D(Screen.width, Screen.height);
         texture.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0);
         texture.Apply();
         byte[] bytes = texture.EncodeToPNG();
         File.WriteAllBytes(pngFile,bytes);        
         DestroyObject( texture );
     }

Same thing happens with memory usage as with Application.CaptureScreenshot(); Could someone explain, what am I doing wrong, or is there a way to avoid this memory leak? I have the same problem when I try to save a picture from WebCamTexture():

 public void TakeSnap ()
     {
         // Timestamp returns the date, so each screenshot name would be unique
             string pngFile = Application.persistentDataPath+"/+Timestamp+".png";
         Texture2D texture = new Texture2D(wct.width, wct.height);
         texture.SetPixels32(wct.GetPixels32());
         texture.Apply ();
         var bytes = texture.EncodeToPNG();
         File.WriteAllBytes( pngFile,bytes);        
         DestroyObject( texture );
 
 }