How to reproduce it :

• On IE11
• I create a page named section 1
• I create a page named section 2
• Next, I want to create a page into the section 1
• I select the section 1 page and I click on the "New page" button
• The assistant of creation of a page appears, I enter a name and save
  > the new page would have to been created info the section 1 but it has been created into section 2 probably because the last action was happened on this last one