Pcie Slot Red Empty

I’ve been trying to set-up a first time rig with some AMD GPUs (1x RX 5700 XT & 1x RX 6900 XT) and slowly expand, the issue seems to be that the Motherboard is not detecting the PCIe slots when I check via the PCIe slot detection. But the slots are shown as red on the slots I have them connected?
I’m attaching a screenshot below to of the PCIe detection tool to give an idea of what I am talking about. Any insights would be greatly appreciate.