Why do new objects interfere with others?

Question

Unity

Faced a strange problem. There is a tower prefab, when a person clicks on it, it shows its area of ​​effect, but! when I add new towers (the same prefab in different spawn locations), I can't click on previous objects. Although the colliders do not intersect anywhere. What could be the reason? Why are objects not clickable? it happens randomly.

Turn on and off by primitive

public void OnMouseDown()
    {
        if(CyrcleUse.activeSelf == false)
        {
            CyrcleUse.SetActive(true);
        }
        else if (CyrcleUse.activeSelf == true)

        {
            CyrcleUse.SetActive(false);
        }

    }