PCIe x1 card won't work in any slot but the x16 slot directly below GPU

HighPoint Rocket 1608A 8-Slot Gen 5 pcie 1x slot Intel® CoreTM Processors 1 x PCIe x16 slot · Intel® B760 Chipset 1 x PCIe x16 slot 1 x PCIe x1 slot pcie expansion slot I cut open the back of a x1 slot on my motherboard to allow me to fit a full size GPU

pcie slot pinout EXPANSION CHASSIS FOR PCIE CARDS: Increase the PCI-e slot count of a desktop computer or server; Add four external PCIe x1 slots;