Not all boards have all those options.
If you try putting gpu1, 2 or 3 in place of gpu 0. Does only the gpu 0 still mine?
I would test each gpu as gpu0 make sure they all work.
Then lets talk about how they are connected?
Risers I assume?
You can also test each riser with the gpu0 and good gpu.
Let me know...if the gpus work its just a matter of figuring out why it doesnt see the others.
Oh and make sure not to connect a gpu/riser from 2 different psu. I see you have 2. So all connection of power to motherboard are off psu 1....and gpu also connected to psu 1 will need its riser powered by psu1. gpus on risers are ok to power off psu2...but be sure the riser gets its power from psu2 also. Assume a y-cable to sync the psus to start together.
On my tests, the gpu0 were always the same. But the gpu 1 and gpu 2 I tried different gpus, always with the same result.
About risers... gpu0 is directly on mobo. Gpu 1 onward with risers. I tried to use new risers with the same result.
About power supply... This rig have two psu (750w), but first there is only one plugged on the mobo with total of 3 gpus. So... no mixing psu cables.
What I haven't tried yet is to change the gpu0. I'll try that and come back to report.