I changed the UID, but page with old UID is still active?

@marcellothearcane I am not sure if this will solve my problem.

My client creates a lot of unique landing pages which he duplicates previous pages and he changes the URL.

So for example, he has a page with URL "/linkedin-proposal", he sends it across, he makes the call/deal and then 5 days later, he wants to create a new page called "/microsoft-proposal" which is almost exactly the same as the linkedin proposal page, but with different copy.

The problem is that the old linkedin proposal page is still working, but this time is showing microsoft proposal copy, because it fallsback to the new copy.

Any advice of how I can tackle this?