On Mouse Click Button event

Hai guys, i already could show the tooltip on each button whenever the mouse button hover that button. However, the button function did not run, but the tooltip shown.

Here is the code:

 Rect buttonRect = new Rect(0, Screen.height - buttonHeight * 3, buttonWidth, buttonHeight);
 Rect tooltipRect = new Rect(100 + 10, Screen.height - buttonHeight * 3 + 5, buttonWidth, buttonHeight);
 
     public virtual void TurnOnGUI()
         {
             label1.normal.textColor = Color.red;
     
             //Text Field
             if (GUI.Button(textRect, ""))
             {
     
             }
     
             //ToolTip Text
             GUI.Button(buttonRect, new GUIContent("Move", "Move the Player"));
             GUI.Label(tooltipRect, GUI.tooltip, label1);
     
             GUI.tooltip = null;
             //Move Button
             if (GUI.Button(buttonRect, "Move"))
             {
                 if (!moving)
                 {
                     GameManager.instance.RemoveTileHighlights();
                     moving = true;
                     attacking = false;
                     GameManager.instance.HighlightTilesAt(gridPosition, Color.blue, movementPerActionPoint);
                 }
     
                 else
                 {
                     moving = false;
                     attacking = false;
                     GameManager.instance.RemoveTileHighlights();
                 }
             }
        (.... other codes...)

Here is the image (Mouse hover at Move Button):

When i delete the tooltip text, the function run like the image below (Move Button):

How do i solve this guys? Thanks in advance!