It's probably a result of the XLR pin 2/3 polarity problem. Years ago, the standard was different in the US vs Europe. Wasn't a big problem, as long as everything is connected to one mixer. But if you use different preamps, it can be a pita.
Probably someone complained the XLR on these speakers was wired wrong. Probably someone with a second pair of monitors, or a sub. And reversing polarity in the firmware was the easiest fix for Alesis...
You were just unfortunate to get a swap when the new firmware came out. I wouldn't blame Sweetwater, as it is an unlikely problem. Besides, I've seen it in passive speakers too...
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