I used to duplicate a webpage template however recently New Express implements a redirect to a previously published project instead of giving it a unique URL. This is definitely a bug as the template i'm duplicating isn't even a published project. This needs to be fixed ASAP
Sorry for not replying earlier. The underlying bug is now fixed, so it should not happen on any new duplicate web pages you create. But the fix does not patch any existing duplicates that were redirecting incorrectly, so you'd have to duplicate again now. Sorry for the incovenience, and thanks for your patience.