Hello Team - We are using AEM 6.5, After creating the experience fragment, I get a pop-up dialog for successful creation with "Done" & "Open" button, if I click the open button from there, I get a dual header like the below and not able to use the menu options. But the same opens perfectly when I open the experience fragment from the folder (Using Edit option). Could somebody throw some light to resolve the issue.
Its the issue with your Experience Fragment Template. Check the page which experience fragment is using. You can remove context Hub lines from page if not required. There should be two files if you are not exploring much in XF .
Also, Please check-in XF template structure that you have included any other component mistakenly in nodes or in properties.
You can also try to create XF in the existing project and compare the structure.