Odd responsive behaviour when changing preset pages

Hi, I’m editing my page to behave correctly in the mobile screen size, but it seems that there is an issue with the width of my page in mobile mode and the ruler at the top.
When I select the mobile icon the page width doesn’t adapt to the mobile size, but as long as I change something in the setting of the container it resizes the page correctly.

BubbleIssue

Can anyone please help me?