Last modified: 2014-09-19 17:45:14 UTC
This might possibly be an API issue ? But it definitely is affecting the users in the mobile version.
Prioritization and scheduling of this bug is tracked on Trello card https://trello.com/c/y80vKkKY
Change 149326 had a related patch set uploaded by Jdlrobson: WIP: Make mobile watchlist use core code https://gerrit.wikimedia.org/r/149326