The Git repository token page now uses POST/Redirect/GET for token creation and non-AJAX actions. The newly created token is carried to the redirected page for its one-time display, so refreshing the page no longer asks to resubmit the form. The Git Repositories Help article documents the behavior.
Refreshing the repository token page does not repeat creation
Creating a Git repository token now redirects back to the token page before showing the one-time token.