CANNOT ACCESS MY CART OR MY WISH LIST

I cannot access my Cart or Wishlist. Whenever I click the down arrow or the See What's In Cart list or the Wishlist it goes back into the "sign-in" page. It happens over and over and over and I cannot get passed this issue. I cannot make a purchase or pay for anything already in my Cart. I cannot delete any items out of my Cart. I cannot use my Wishlist to add anything to my Cart. What's going on Amazon?