The bug

When I try to get on a realm I am currently invited to, the "Buy A Realm" pop up covers the screen and I can't exit out of it. I've tried restarting my Mac, signing in and out of my minecraft account, entering full screen, clicking on both "Buy A Realm" and "Get A Trial", yet nothing works. I always come back to that pop up and I can't get on my friend's realm or any others.