Anyone ever get sound coming from the wrong speaker?

[Kermit power]

I'm watching The Recruit on Netflix at the moment. Oddly, the main sound seems to be coming out of the rear left speaker on my surround sound, not the centre speaker!

Is anyone else finding this? I've experienced it once before, but can't remember the program. Everything else is working normally, so I can't figure out why just this one isn't working properly?