Sort notebooks by updated fails

[charlieedstrom 31]

Did no see this when I searched forums so if its a duplicate, sorry.

I found under both the Windows client and Web client, when viewing all notebooks and clicking Updated header to sort, it doesn't really sort in chronological order. I don't see the pattern to the sort, so I can't tell what its really sorting by.

Is this expected behavior? Am I just not seeing how its sorting?

EN Windows V 10.1.4 Build 1880