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this is bug. the issue is like this:
1. userA friend with userB, and userB friend with userC
2. userA create new album with Friends only privacy, and upload single photo
3. userB open that album and put comment on that album/photo
4. userB open the photo on that album an comment on that photo
5. goto frontend
6. you can see there are 2 new stream items
7. login as userC have a look at stream
and the issue will happen. please wait for the fix.
notification began to appear by itself, no changes I did not write. The question was solved when I added a simple text theme. But it is a bug, albeit rare.
Well, I will wait for the decision on the matter.