Tonight I was playing with the web interface for Lightroom. I noticed a handful of albums listed under the shared section. Labeled invite only, so no real harm. I thought this was odd, because I had not recalled ever using the shared album feature, especially not on these particular albums.
I checked the iOS and Mac app and none of these albums were showing under shared albums.
As a test I shared another album. It showed up in the shared album section (by iteself in the apps, along with the other albums on the web). Then unshared it, and it cleared away like expected from the apps and web.
I then tested one of the albums that was showing as shared on the web, but not in the apps. I shared it, then unshared it, in order to see if it would clear up the issue. The album added to the shared album section on the apps like expected, and then cleared away when I unshared it. It remained in the shared album section on the web.