The Game Team is aware of the current drop in Onslaught Rankings after the recent Maintenance. We are actively looking into it and working on a resolution.
Please check in with this page or our News periodically for updates.
We appreciate your patience and understanding.
**Update: The Game Team has recalculated everyone's rankings as of the maintenance on 10/16/18. If you are still seeing the wrong rankings, please make sure your game is up-to-date.
We have also posted this article in our News Site with the new Season 1 - Season 3 end and start dates.
Thank you and good luck!