PDF Document: Margin is not changing back.

I had to select default again since the numbers weren't changing back. 

https://www.jotform.com/pdf-editor/81978103284159

It seems the margin is set to default. If you wish to use the custom margin, please uncheck the Use default margin settings field and customize the margin as per your wish.

In case, if you are facing any issues - could you please provide more information?