Yes, Susie, I'm wondering about over neutralizing and/or possibly that the scent is reacting with the borax. I'm not at all sure, but the OP's pics don't show something that looks like a simple separation of scent from the soap. That should just be a thin film, not a thick white layer.
I understand the thinking that borax can't reduce the pH below its intrinsic pH, but that's doesn't mean it can't cause molecular mischief if too much is added.
I understand the thinking that borax can't reduce the pH below its intrinsic pH, but that's doesn't mean it can't cause molecular mischief if too much is added.