A330 glitch or bug?

I was sitting at my gate in the newly reworked A330 and while I was filling out my flight plan, I noticed I heard my engines running, so I checked and my engines weren't even on nor starting up. The winds were less than 4 knots and there were no aircraft nearby. I don't know if this is a bug or not but in case anybody else has this issue it might be able to be solved.

Are you sure your APU wasn’t turned on? It is also an engine in a way. You can check it by going into systems → electrical

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So I just went into solo flight mode and turned everything off except for APU and that was it. Thank you!