Weird ignition issue years after having sub installed in 2013 Hyundai Sonata

[schwol]

Wondering if anyone has heard of something like the issue I have with my car. 2013 Hyundai Sonata GLS, stock radio. Had a sub/amp installed when I bought the car. 3 years later, pumping gas and get back into my car. Keys in hand, notice the engine is still running without a key in the ignition. I ignore the problem until it happens again a few months later. Take it to Hyundai and they say whoever installed the system didn't install it correctly (I would have no idea, newbie here). I'm having a more reputable shop install this like new in a few days. Just curious if anyone's seen something like this.

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[fithwheel]

I've heard of something like that before 

It's called bull shit