Tile rendering issues

public override Vector2 Position
{
    get
    {
        Vector2 ret;

        if (UseCameraWorldLimits)
        {
            // clamp the returned position to CameraWorldLimits (if used)
            ret = new Vector2(MathHelper.Clamp(base.Position.X, CameraWorldLimitMin.X, CameraWorldLimitMax.X),
                              MathHelper.Clamp(base.Position.Y, CameraWorldLimitMin.Y, CameraWorldLimitMax.Y));
        }
        else
        {
            ret = base.Position;
        }

        // Convert to pixel coordinates.
        // The following assumes your target resolution is 1280x720
        // and your camera size is 128x72.  In this case, we want to
        // return the position in increments of 0.1.
        ret.X = (float)Math.Round(ret.X * 10.0f, 0) / 10.0f;
        ret.Y = (float)Math.Round(ret.Y * 10.0f, 0) / 10.0f;
        return ret;
    }
    set
    {
        base.Position = value;
        _isMoving = false;
        _UpdateSceneRegion();
    }
}