Motor will not stop spinning with APM

Hi, I have a strange problem. I have a motor that will not stop spinning after starting when apm is started. I'm using a Raspberry Pi with Navio+ board to provide apm, and when I start apm on my Raspberry Pi the motor will start spinning and keep spinning until I shut down the Pi, even if I stop apm. The thing doesn't have to arm to start the motor spinning. I can arm it and make the other motors turn and spin but can't stop the one that's always spinning. If I send it a signal it will increase its speed but will not stop. Sometimes if I send another motor a signal the spinning one will also respond to the signal by increasing its own speed while the motor I tried to turn responds too. I'm using simonk 12A escs, the one that's connected to the spinning motor is new (the old one burned out and I replaced it). This is weird. Any thoughts? Video attached

weirdspinningmotor.MOV

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