I've been having this issue with all the latest versions of Photoshop. My file continually prompts me to save when I've already saved. This happens sometimes up to 7 times. It's rather frustrating. I could save my file fine, but once I do an export of this file (for web) then it prompts me numerous times to save.
Export settings are saved in metadata, so the file is changed, and you need to save if you want to keep it. Same goes for printing and anything else recorded in the metadata.
And then of course anything you do to the pixel data will prompt a save request. Whenever a Save request comes up, it's because something has changed, and it pays to always think about what that might be before you commit or dismiss.
I understand prompting to save once I've exported, I also understand this once I've changed anything in the file. But, prompting me to save after I've exported my files, which I do, and then repeatedly prompting after clicking save the first time is not normal. I've never had this issue on older versions, but always the latest version that gives these issues.
I'm on Mac. It's not the first time that the latest version of PS cc does this. I've also had an Adobe agent try sorting out to no avail and then requesting I downgrade my version. I'll rather just post in that forum.