Retrieving Multitouch Data in XNA

Question

I am having a problem retrieving touch input on my XNA game. Here is my starting code:

TouchCollection touchPositions;
List<Vector2> touchReleases = new List<Vector2>();

Then this is my update code:

protected override void Update(GameTime gameTime)
{          
    // Other update logic here

    touchReleases.Clear();
    foreach (TouchLocation tl in touchPositions) 
    {
        if (tl.State == TouchLocationState.Released) 
           touchReleases.Add(tl.Position); 
    }
    base.Update(gameTime);
}

The idea is to load all of the releases into a Vector2 list. Then (during the draw code) a function checks for a release to do stuff.

EDIT: I tested this using Guide.BeginShowMessageBox() during the foreach loop. It popped up every time I released.

bool released = false;
foreach (TouchLocation tl in touchPositions)
{
    // checks to see if the button is being hovered on     
}
foreach (Vector2 tr in touchReleases)
{
    if (PointInArea(tr, new Rectangle((int)position.X, (int)position.Y, buttonimage[0].Width, buttonimage[0].Height))) 
    { 
        released = true; 
        break; 
    }
}
return released;

The PointInArea function checks to see if a Vector2 is in a Rectangle. I know this function is working right.

What's funny is that the buttons respond to releases about once every 4 taps. Does anyone know why this is?