How to stop lag between Vectrosity circle and GUI.Label at mouse cursor?

I am using Vectrosity to draw a circle at the mouse location, and then would like to draw text in the center of it. I'm using GUI.Label to draw the text. The problem is that the Vectrosity circle is lagging behind the GUI.Label when the mouse is moving. The faster you move it, the more it's off; to the point of being outside the circle. How do I make sure that these are in the same location? Note that this also happens when using "Input.mousePosition" rather than "Event.current.mousePosition".

Here's a simplified example, and a screenshot of what I see:

 using UnityEngine;
 using System.Collections;
 using Vectrosity;
 
 public class TestMouse : MonoBehaviour {
     
     private VectorLine rings;
     
     // START
     void Start()
     {
         // Vectrosity Lines & Points; Drawn later with MakeCircle
         rings = new VectorLine("Ring1", new Vector2[32], Color.white, null, 4, LineType.Continuous);
     }
 
     // GUI
     void OnGUI () 
     {            
         float mousex = Event.current.mousePosition.x;
         float mousey = Event.current.mousePosition.y;
         
         // Ring
         rings.MakeCircle(new Vector2(mousex, Screen.height - mousey), 30);
         rings.Draw();
         
         // Draw text
         Vector2 textSize = GUI.skin.label.CalcSize(new GUIContent("Test"));
         GUI.Label ( new Rect(
             mousex - (textSize.x / 2), 
             (mousey - 15), 
             textSize.x, 
             20), 
             "Test"
         );
     }
 }