I have implemented a change to how ladder leaving and re-joining works. From now on, if you leave a ladder or are removed from it due to losing the site membership, the information about your rung is preserved for one week. If you rejoin the ladder within a week, you will be placed back to the rung where you would have been if you hadn't left the ladder.
This will prevent a loss of your rung if you accidentally quit the ladder, of if you forget to renew your membership in time, but fix it within a week.
Enjoy!