Sign Up link & direct links to Membership Signup page all redirect to main home page?

Greetings,

For some reason, the “Become a Member” page ( http://untci.org/become-a-member/) and also each Sign-Up link on the Your Memberships page (http://untci.org/memberships/) all now redirect to the main page of my website.

These were working fine a few days ago. So, for who knows how many days, I have been loosing revenue & frustrating my members. I need an objective eye asap, please. Thank you.

Dr. W