In desktop, users can fine tune their watchlist by showing / hiding minor edits, bots, etc.
The mobile watchlist follows the same preferences. Desktop and mobile watchlists contain the same items.
When the same users use the mobile watchlist, their preferences are ignored. This is problematic per se, but it is even more problematic in mobile because the limitations of the UI make excessive results more evident.
For instance, I only hide edits made by bots in order to focus on reviewing in changes made by humans. In mobile I do see the edits done by bots, cluttering my list and forcing me to scroll through items I don't care about. Sometimes a bot goes through dozes of pages I'm watching, and the edits made by bots will fill most of the mobile watchlist, which has a limited length, not allowing me to see relevant changes made just a few hours ago.
The UI for changing the watchlist preferences available in mobile is out of scope in this report. It is fine to have them only in desktop, as long as they are followed in mobile as well.