Wondering for some help.

Looked at the online tool, and I can see the pricing for ex OSL and ex CAI obviously being lower. When travelling through Australia on QF, the price ends up repricing into AUD. I wonder why that is? Is there some way of avoiding this?

And I've noticed that there is always low availability around QF for flights in D. How does this interact with the Point of Sale and Point of Origin? It's not very clear online or in the FAQ above. Are there certain flights that have even more restricted D availability than if we were to book originating in, say, the UK or France?