That's expected. All PCIe endpoints in your case have *non-prefetchable* 64-bit BARs. These can only reside below 4 GB, so EDK2 downgrades them to the 32-bit non-prefetchable aperture.
If you had a device with a *prefetchable* 64-bit BAR (e.g. GPU VRAM), it would enumerate as "PMem64" and then you'd see it being allocated to the 64-bit prefetchable aperture.
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[rebecca@openfw.io]
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