Perhaps it'll be more obvious here. And don't be mistaken about the background. This was not rendered over white. It's transparent because it was saved as a png and then later put onto a white background. The actual background I see in Poser is the default grey (I'm rendering in a room, but it's invisible to camera).

The thing is, the ones with the weird transparency are all dark colours. I'm sure there's significance to that. It's almost like Poser is looking at the dark colours in my ColorRamp and thinking: Black. Transparent. But surely that's not the case.

I'll try to post my shaders in a minute.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3