I did:
So let me try again, in a simpler way. A background task is fired when the app is installed; last process on it, actually. As you might know, background tasks (queue) runs based on a task that runs at every minute or so, if you’re using Cron; if you’re not, it might take a few minutes. After start, it will copy the data from the plugin table to a new table created by the app. Depending on how many records you have, it can take more than one batch to go through all records and insert into new table. The whole process can take a few minutes, again, depending on your server configuration/number of records.
So if you went immediately to Plugins page and manually uninstalled it, you deleted the data from real moderators of your warnings. All you had to do was: go to Dashboard (you would see the background task there); wait a couple of minutes or even ask in this topic before uninstall the plugin.
Btw, I’ll release a new version to add a routine (existing in the plugin and forgotten in the app) to swap the generic moderators for the real one when uninstalling the app.