Why is my Home page being protected unnecessarily in membership?

Hello,

Membership has been functioning fine for quite a while now, but I just checked today and my Home page is redirecting to my protected content page for people not logged in. This is unusual, because the home page is supposed to be visible to all people. I don't know exactly when it started, but I just noticed it. And it hasn't always been doing this. Could someone help point me in the right direction to fix this?