I've seen quite a few older threads regarding the issue of Muse insisting on publishing all pages, regardless of whether they are modified or not.
Does anyone know of a current fix for this?
What exactly did you modify in which place?
Did you modify a master page element?
Did you try to delete all data from your hosting server, republish your complete site (not only modified files) and then try again to publish „only modified files“?
In my case, I experimented and discovered that simply toggling any layer off/on will trigger an upload of all pages.