Hello Hermann,
Thank you for reaching out and I am happy to assist you with this.
I’ve checked the page you shared https://gr8leaders.com/login/ and I can see that W3 Total Cache is enabled, however, I am not experiencing any problems with displaying the login elements when the page is loaded:
Can you please confirm that the issue occurs in some specific browser and have you tried clearing your browser Cache?
I am referring to the green login box. Please let me know if I understand the problem correctly.
Thanks!