If you use the digital version of The Wall Street Journal, perhaps you have noticed this issue with the Saved section.
Once in a while, you are momentarily greeted by a completely unfamiliar reading list.
I'm never clear whether these belong to another active subscriber, some distortion of my activity from a long time ago, or are just phantom placeholder rows, but even the total number of saved items doesn't match my real list. It is quite disconcerting to see what at first glance feels like someone else's data rendered inside your authenticated session.
In practice, pulling to refresh a couple of times usually clears the entries and restores my actual list.