there was nothing added nor changed in the pages, no screenshots added, removed nor changed, etc.
I cannot categorically rule that out. But even a single space added to the text and the developer hitting the save changes button would update that time stamp. Probably hitting the save changes button and no changes at all would do that.
My question was, if this is about the Itch app. If the Itch app presented you games as new, even though the content did not change. Because on the website this is usually not so. The games are sorted by publishing date or most recent staff aproved devlog. Changing the page's update date and even changing the files would not normally trigger that on the website.
So I would consider the app showing you games as updated, even though the files did not change, as a bug. No matter if the publish date on the back end was buggy or not. That could of course still be a problem, but even so, it should not have shown those games as updated without files being changed.