Membership signup redirects to homepage

I'm having random problems with the signup link redirecting back to the homepage of my site. Sometimes I create a new plan and it goes to the actual signup page. Then I edit the plan and it starts redirecting to the homepage. Sometimes I create a plan from scratch and it only redirects to the home page. At wits end.

Hi Joe

The issue you mentioned is strange. Maybe something wrong with your settings ? Please submit a support ticket sending us administrator account of your site so that I can check it for you !

Tuan