If you look at the one on the other side though, it looks a more conventional angle? Perhaps its an optical illusion after all?

I think it is an optical illusion.

The flap mountings are raked at the angle of sweep of the trailling edge and I think that this combined with the large angle of deflection cause the illusion.

And….. common sense would dictate that there’d be a large lift/drag asymmetry if the flaps were set at such a different angle. I can’t see this being a ‘real’ thing.