Automatic Payment set up by itself?

My parents discovered today that the monthly mortgage rate was already paid when they went to pay it. It was automatic pay, which they don't use. They think they set it up by mistake last month, but I've read about it, it seems hard to accidently set up, especially because they usually pay $180 a month instead of the recommended $360, but this month it automatically paid the $360. My idea was that my mom might've clicked set up auto pay last month but I figured it wouldve also paid $360 last month or auto paid $180 this month. Ideas?

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