It would appear that these pages do not share the same foundation elements eg on menu.html it is item1 that contains the menu etc but on the about-us page it is item2
The settings for these 2 elements are different between these pages so I expect that is where your shift is coming from.
It might be that you need to decide which is the one that is correct and copy/paste between pages so that you get them the same.
This can come about if you have edited a master item on a child page.
You might be able to rectify it by using the Use Master Content, Use Master Settings on these containers (if you are working from a Master)