Hi,
See my post here Too frequent "New revision uploaded" notifications in OJS 3.1.1.2 and the discussion here Author Confirmation Notice that Revised File Has Been Received · Issue #2665 · pkp/pkp-lib · GitHub.
I just fixed the issue on our own server. Not sure if/when something will happen in the core code to solve that. I got a lot of complaints from our editors after the change there.