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It's because you told it to: https://www.akeebabackup.com/documentation/troubleshooter/atspecialusers.html Please read the documentation. Admin Tools has a ton of features. Many of them are designed to harden standard Joomla! features and at first you might consider them to be bugs. In fact they are anything but. This feature is what will stall an attacker who has gained access to your site's back-end long enough for you to be able to turn on the Emergency Off-Line mode before the attacker has the chance to lock you out of your own site and hold it hostage, asking for ransom (a very typical hacking scheme).