I have a list in Office 365
There are 70 items in it
But in the site content it keeps showing 76
What is causing this difference?
Its not a document library and there are no folders in the list
You may use REST API by appending _api/web/lists/GetByTitle('MyList')/Items to the Site collection url to get all items in the list. Example usage is : http://mydomain/_api/web/lists/GetByTitle('MyList')/Items
Normally what happens here is that there are documents in the library that were uploaded for the first time and never checked in, so only the owner of the files can see them no matter the view or permissions you have.
You can access the Library settings and then click on "Manage checked out files" / "Manage files which have no checked in version" and you will probably see the remaining files of the total number of items that SharePoint is seeing. Please refer to the below URL :