Removed link Shared to Collaborate still works in Forms

[Viktoria Johansson]

Hi. I have removed a link "shared to collaborate" because I no longer want my colleague to be able to see the answers in my private form.
Then I created a new link "shared to collaborate" to another colleague, she can use the old 

and new link to edit the form.

Why is the old link still working?

[#2]

Try ending the old form by setting the start and end date

 @Viktoria Johansson