False Positive Phising

I am on a mac, running AVG Free and Google Chrome, I continually receive a pop up "Threat Secured" message (URL: Phishing). 

The URL listed is signup.spaceboost.com 

Screenshot: https://drive.google.com/file/d/1ccJmmeK_p6X6w2e-YfEqq9GGKCsVdBeC/view?usp=sharing

Thoughts?  Thank you!