I'm new to SharePoint in my organization, so I would really appreciate any advice, even if it's just how to troubleshoot this more.
I only noticed this for the one person though. When I tried uploading a picture today (on one of the profile from the original set), it changed it for yesterday's birthday person, but not for today's birthday person.
I had found a sort of related article that mentioned having <10kb for the photo size. That has never been an issue for us before, but I tried it anyway. Using a 2KB photos has the same results.
Like I said, I would appreciate any advice in troubleshooting this, since I'm not really familiar with all of the SharePoint components involved. It's a really weird thing and I have yet to find any posts with a similar issue. Thank you.